| Cabalzarite | CaMg₂(AsO₄)₂·2H₂O | Monoclinic | — | — |
| Cabrerite | NiMg₂(AsO₄)₂·8H₂O | Monoclinic | — | — |
| Cabriite | Pd₂CuSn | Orthorhombic | — | — |
| Cabvinite | Th₂F₇(OH)·3H₂O | Tetragonal | — | — |
| Cacoxenite | Fe³⁺₂₄AlO₆(PO₄)₁₇(OH)₁₂·75H₂O | Hexagonal | — | — |
| Cadmium (native) | — | Hexagonal | — | — |
| Cadmoindite | CdIn₂S₄ | Cubic | 4.0 | 4.79 g/cm³ |
| Cadmoselite | CdSe | Hexagonal | 4.0 | 5.48 g/cm³ |
| Cadsulfohite | Cd₂(SO₄)(OH)₂ | Monoclinic | — | 4.55 g/cm³ |
| Cadvanite | Cd(VO₃)₂ | Monoclinic | — | 4.80 g/cm³ |
| Cadwaladerite | AlCl(OH)₂·4H₂O | Cubic | — | 1.66 g/cm³ |
| Caesiumpharmacosiderite | CsFe₄[(AsO₄)₃(OH)₄]·4H₂O | Cubic | — | — |
| Cafarsite | Ca₅.₉Mn₁.₇Fe₃Ti₃(AsO₃)₁₂ * 4-₅H₂O | Cubic | — | — |
| Cafeosite | Ca₄Fe²⁺₃Fe³⁺₂◻O₆S₄ | Orthorhombic | — | — |
| Cafetite | CaTi₂O₅·H₂O | Monoclinic | — | — |
| Cahnite | Ca₂[B(OH)₄](AsO₄) | Tetragonal | 3.0 | — |
| Cairncrossite | Sr₂Ca₇(Si₄O₁₀)₄(OH)₂·15H₂O | Triclinic | — | — |
| Calamaite | Na₂TiO(SO₄)₂*₂H₂O | Orthorhombic | — | — |
| Calaverite | AuTe₂ | Monoclinic | — | 8.86 g/cm³ |
| Calciborite | CaB₂O₄ | Orthorhombic | — | 2.87 g/cm³ |
| Calcinaksite | KNaCa(Si₄O₁₀)·H₂O | Triclinic | — | — |
| Calcio-olivine | Ca₂(SiO₄) | Orthorhombic | — | 2.96 g/cm³ |
| Calcioancylite-(Ce) | (Ce,Ca,Sr)CO₃(OH,H₂O) | Orthorhombic | — | — |
| Calcioancylite-(Nd) | Nd₂.₈Ca₁.₂(CO₃)₄(OH)₃·H₂O | Monoclinic | — | — |
| Calcioandyrobertsite | KCaCu₅(AsO₄)₄(H₂AsO₄) * 2H₂O | — | — | — |
| Calcioaravaipaite | PbCa₂AlF₉ | Triclinic | — | 4.48 g/cm³ |
| Calcioburbankite | Na₃(Ca,Ce,Sr,La)₃(CO₃)₅ | Hexagonal | — | — |
| Calciocatapleiite | CaZr(Si₃O₉) * 2H₂O | — | — | — |
| Calciocopiapite | CaFe³⁺₄(SO₄)₆(OH)₂·20H₂O | — | — | — |
| Calciodelrioite | Ca(VO₃)₂·4H₂O | Monoclinic | — | — |
| Calcioferrite | Ca₂Fe³⁺₂(PO₄)₃(OH) * 7H₂O | Monoclinic | — | — |
| Calciohatertite | — | Monoclinic | — | — |
| Calciohilairite | CaZrSi₃O₉·3H₂O | — | — | — |
| Calciojohillerite | NaCaMg₃(AsO₄)₃ | Monoclinic | — | — |
| Calciolangbeinite | K₂Ca₂(SO₄)₃ | Cubic | — | 2.73 g/cm³ |
| Calciomurmanite | (Na,☐)₂Ca(Ti,Mg,Nb)₄[Si₂O₇]₂O₂(OH,O)₂(H₂O)₄ | Triclinic | — | — |
| Calciopetersite | CaCu₆(PO₄)₂(PO₃OH)(OH)₆·3H₂O | Hexagonal | — | — |
| Calciopharmacoalumite | Ca₀,₅Al₄(AsO₄)₃(OH)₄·5H₂O | Cubic | — | — |
| Calciosamarskite | (Ca,Fe,Y)(Nb,Ta,Ti)O₄ | — | — | — |
| Calciotantite | CaTa₄O₁₁ | Hexagonal | — | 7.55 g/cm³ |
| Calciouranoite | (Ca,Ba,Pb,K,Na)U₂O₇·5H₂O | Triclinic | 4.0 | — |
| Calcioursilite | Ca₄(UO₂)₄(Si₂O₅)₅(OH)₆·15H₂O | — | — | — |
| Calcioveatchite | SrCaB₁₁O₁₆(OH)₅·5H₂O | Monoclinic | — | — |
| Calcite | CaCO₃ | Trigonal | 3.0 | 2.72 g/cm³ |
| Calcjarlite | NaCa₃Al₃F₁₆ | Monoclinic | — | — |
| Calclacite | Ca(CH₃COO)Cl·5H₂O | Monoclinic | 1.0 | — |
| Calcurmolite | (Ca,Na)₂(UO₂)₃Mo₂(O,OH)₁₁ * nH₂O | — | — | — |
| Calcybeborosilite-(Y) | (Y,REE,Ca)(B,Be)₂(SiO₄)₂(OH,O)₂ | — | — | — |
| Calderite | (Mn²⁺,Ca)₃(Fe³⁺,Al)₂(SiO₄)₃ | Cubic | 7.0 | — |
| Calderónite | — | — | — | — |
| Caledonite | Cu₂Pb₅(SO₄)₃(CO₃)(OH)₆ | Orthorhombic | — | — |
| Calkinsite-(Ce) | (Ce,La)₂(CO₃)₃ * 4H₂O | Orthorhombic | — | — |
| Callaghanite | Cu₂Mg₂(CO₃)(OH)₆ * 2H₂O | Monoclinic | — | — |
| Calomel | HgCl | Tetragonal | — | 6.92 g/cm³ |
| Calumetite | CaCu₄(OH)₈Cl₂·3.5H₂O | — | — | — |
| Calvertite | Cu₅Ge₀.₅S₄ | Cubic | — | 5.24 g/cm³ |
| Calzirtite | Ca₂Zr₅Ti₂O₁₆ | Orthorhombic | — | 4.84 g/cm³ |
| Camanchacaite | NaCaMg₂[AsO₄][AsO₃(OH)]₂ | Monoclinic | — | — |
| Camaronesite | Fe³⁺₂(PO₃OH)₂(SO₄)(H₂O)₄·1-2H₂O | Trigonal | — | — |
| Cameronite | Cu₅₋ₓ (Cu,Ag)₃₊ₓTe₁₀(with x=0.43) | Tetragonal | — | — |
| Camgasite | CaMg(AsO₄)(OH)·5H₂O | Monoclinic | — | — |
| Caminite | Mg₇(SO₄)₅(OH)₄·H₂O | Tetragonal | — | — |
| Campigliaite | Cu₄Mn²⁺(SO₄)₂(OH)₆·4H₂O | Monoclinic | — | — |
| Campostriniite | (Bi₂.₅Na₀.₅)(NH₄)₂Na₂(SO₄)₆·H₂O | Monoclinic | — | — |
| Camérolaite | Cu₆Al₃(OH)₁₈(H₂O)₂[Sb(OH)₆](SO₄) | Monoclinic | — | — |
| Canaphite | — | Monoclinic | 2.0 | — |
| Canasite | K₃Na₃Ca₅Si₁₂O₃₀(OH)₄ | — | — | — |
| Canavesite | Mg₂(HBO₃)(CO₃)·5H₂O | Monoclinic | — | — |
| Cancrinite | (Na,Ca,☐)₈(Al₆Si₆)O₂₄(CO₃,SO₄)₂·2H₂O | Hexagonal | — | — |
| Cancrisilite | Na₇(Si₇Al₅)O₂₄(CO₃)·3H₂O | Hexagonal | 5.0 | — |
| Canfieldite | Ag₈SnS₆ | Orthorhombic | — | 6.23 g/cm³ |
| Cannizzarite | Pb₄₈Bi₅₆S₁₃₂ | — | — | — |
| Cannonite | Bi₂(SO₄)O(OH)₂ | Monoclinic | — | — |
| Canosioite | Ba₂Fe³⁺(AsO₄)₂(OH) | Monoclinic | — | — |
| Canutite | NaMn₃[AsO₄][AsO₃(OH)]₂ | Monoclinic | — | — |
| Caoxite | CaC₂O₄·3H₂O | Triclinic | — | — |
| Capgaronnite | AgHgClS | Orthorhombic | — | — |
| Cappelenite-(Y) | Ba(Y,Ce)₆Si₃B₆O₂₄F₂ | — | — | — |
| Capranicaite | KCaNaAl₄B₄Si₂O₁₈ | Monoclinic | — | — |
| Caracolite | Na₂(Pb₂Na)(SO₄)₃Cl | Monoclinic | — | — |
| Carboborite | Ca₂Mg[B(OH)₄]₂(CO₃)₂·4H₂O | Monoclinic | — | — |
| Carbobystrite | Na₈(Al₆Si₆O₂₄)(CO₃)·4H₂O | Trigonal | — | — |
| Carbocalumite | — | Trigonal | — | — |
| Carbocernaite | (Ca,Na)(Sr,Ce,Ba)(CO₃)₂ | Orthorhombic | 3.0 | — |
| Carboferriphoxite | [(NH₄)K(H₂CO₃)][Fe³⁺(HPO₄)(H₂PO₄)(C₂O₄)] | Triclinic | — | — |
| Carboirite | FeAl₂(GeO₄)O(OH)₂ | — | — | — |
| Carbokentbrooksite | Na₁₁-₁₂(Na,Ce)₃Ca₆Mn₃Zr₃Nb[(Si₃O₉)₂(Si₉O₂₇)₂SiO](OH)₃(CO₃) * H₂O | Trigonal | — | — |
| Carbonatecyanotrichite | Cu₄Al₂CO₃(OH)₁₂·2H₂O | Orthorhombic | — | — |
| Cardite | Zn₅.₅(AsO₄)₂(AsO₃OH)(OH)₃*₃H₂O | Orthorhombic | — | — |
| Carducciite | (Ag₂Sb₂)Pb₁₂(As,Sb)₁₆S₄₀ | Monoclinic | — | — |
| Caresite | Fe²⁺₄Al₂(OH)₁₂[CO₃] * 3H₂O | Trigonal | — | — |
| Carletonite | KNa₄Ca₄Si₈O₁₈(CO₃)₄(F,OH)·H₂O | — | — | — |
| Carletonmooreite | Ni₃Si | Cubic | — | — |
| Carlfrancisite | Mn²⁺₃(Mn²⁺,Mg,Fe³⁺,Al)₄₂(As³⁺O₃)₂(As⁵⁺O₄)₄[(Si,As⁵⁺)O₄]₆[(As⁵⁺,Si)O₄]₂(OH)₄₂ | Trigonal | — | — |
| Carlfriesite | CaTe⁴⁺₂Te⁶⁺O₈ | — | — | — |
| Carlgieseckeite-(Nd) | NaNdCa₃(PO₄)₃F | Trigonal | — | — |
| Carlhintzeite | Ca₂AlF₇·H₂O | Triclinic | — | — |
| Carlinite | Tl₂S | Trigonal | 1.0 | — |
| Carlosbarbosaite | (UO₂)₂Nb₂O₆(OH)₂·2H₂O | Orthorhombic | — | — |
| Carlosruizite | K₃Na₂Na₃Mg₅(IO₃)₆(SeO₄)₆·6H₂O | Trigonal | — | — |
| Carlosturanite | (Mg,Fe²⁺,Ti)₂₁(Si,Al)₁₂O₂₈(OH)₃₄·H₂O | — | — | — |
| Carlsbergite | CrN | Cubic | — | — |
| Carlsonite | (NH₄)₅Fe³⁺₃O(SO₄)₆·7H₂O | Triclinic | — | — |
| Carmeltazite | ZrAl₂Ti₄O₁₁ | Orthorhombic | — | — |
| Carmichaelite | (Ti,Cr,Fe)[O₂-x(OH)x] | Monoclinic | — | — |
| Carminite | PbFe³⁺₂(AsO₄)₂(OH)₂ | — | 3.5 | — |
| Carnallite | KMgCl₃·6H₂O | Orthorhombic | 2.5 | — |
| Carnotite | K₂(UO₂)₂(VO₄)₂·3H₂O | Monoclinic | 2.0 | — |
| Carobbiite | KF | Cubic | — | 2.58 g/cm³ |
| Carpathite | C₂₄H₁₂ | Monoclinic | 1.0 | — |
| Carpholite | Mn²⁺Al₂(Si₂O₆)(OH)₄ | Orthorhombic | — | — |
| Carraraite | Ca₃(SO₄)[Ge(OH)₆](CO₃) * 12H₂O | Hexagonal | — | — |
| Carrboydite | (Ni₁-xAlx)(SO₄)x/₂(OH)₂ * nH₂O | Hexagonal | — | — |
| Carrollite | CuCo₂S₄ | Cubic | — | 4.92 g/cm³ |
| Caryinite | (Na,Pb)(Ca,Na)CaMn²⁺₂(AsO₄)₃ | Monoclinic | — | — |
| Caryochroite | (Na,Sr)₃(Fe³⁺,Mg)₁₀Ti₂Si₁₂O₃₇(H₂O,O,OH)₁₇ | Monoclinic | — | — |
| Caryopilite | Mn²⁺₃Si₂O₅(OH)₄ | — | — | — |
| Cascandite | Ca(Sc,Fe³⁺)(HSi₃O₉) | — | — | — |
| Caseyite | — | Monoclinic | — | — |
| Cassagnaite | Ca₄Fe³⁺₄V³⁺₂(OH)₆O₂(Si₃O₁₀)(SiO₄)₂ | Orthorhombic | — | — |
| Cassedanneite | — | Monoclinic | — | — |
| Cassidyite | Ca₂Ni(PO₄)₂·2H₂O | Triclinic | — | — |
| Cassiterite | SnO₂ | Tetragonal | 6.5 | 6.58 g/cm³ |
| Castellaroite | Mn²⁺₃(AsO₄)₂*₄H₂O | Monoclinic | — | — |
| Caswellsilverite | NaCrS₂ | Trigonal | — | 3.24 g/cm³ |
| Catalanoite | Na₂HPO₄·8H₂O | Orthorhombic | — | — |
| Catamarcaite | Cu₆GeWS₈ | Hexagonal | — | 4.81 g/cm³ |
| Catapleiite | Na₂ZrSi₃O₉·2H₂O | — | — | — |
| Cattierite | CoS₂ | Cubic | — | 4.85 g/cm³ |
| Cattiite | Mg₃(PO₄)₂ * 2₂H₂O | Triclinic | — | — |
| Cavansite | — | Orthorhombic | — | — |
| Cavoite | CaV₄+₃O₇ | Orthorhombic | — | — |
| Cayalsite-(Y) | CaY₆Al₂Si₄O₁₈F₆ | Orthorhombic | — | — |
| Caysichite-(Y) | Ca₂Y₂Si₄O₁₀(CO₃)₃ * 4H₂O | — | — | — |
| Cebaite-(Ce) | Ba₃Ce₂(CO₃)₅F₂ | Monoclinic | — | — |
| Cebollite | Ca₅Al₂(SiO₄)₃(OH)₄ | — | 5.0 | — |
| Celadonite | — | Monoclinic | 2.0 | 3.00 g/cm³ |
| Celestine | SrSO₄ | Orthorhombic | 3.2 | 3.98 g/cm³ |
| Celleriite | — | Trigonal | 7.0 | — |
| Celsian | BaAl₂Si₂O₈ | Monoclinic | — | 3.34 g/cm³ |
| Centennialite | CaCu₃Cl₂(OH)₆·nH₂O (n~0.7) | Trigonal | — | — |
| Cerchiaraite-(Al) | Ba₄Al₄(Si₄O₁₂)O₂(OH)₄Cl₂[Si₂O₃(OH)₄] | Tetragonal | — | — |
| Cerchiaraite-(Fe) | Ba₄Fe³⁺₄(Si₄O₁₂)O₂(OH)₄Cl₂[Si₂O₃(OH)₄] | Tetragonal | — | — |
| Cerchiaraite-(Mn) | Ba₄Mn³⁺₄(Si₄O₁₂)O₂(OH)₄Cl₂[Si₂O₃(OH)₄] | Tetragonal | — | — |
| Cerianite-(Ce) | CeO₂ | Cubic | — | 6.99 g/cm³ |
| Cerite-(CeCa) | (Ce₇Ca₂)☐Mg(SiO₄)₃(SiO₃OH)₄(OH)₃ | — | — | — |
| Cerromojonite | CuPbBiSe₃ | Monoclinic | — | — |
| Ceruleite | Cu₂Al₇(AsO₄)₄(OH)₁₃ * 1₁.₅H₂O | — | — | — |
| Cerussite | PbCO₃ | Orthorhombic | — | 6.60 g/cm³ |
| Cervandonite-(Ce) | (Ce,Nd,La)(Fe³⁺,Fe²⁺,Ti,Al)₃O₂(Si₂O₇)(As³⁺O₃)(OH) | Monoclinic | — | — |
| Cervantite | Sb³⁺Sb⁵⁺O₄ | Orthorhombic | 4.5 | — |
| Cervelleite | Ag₄TeS | — | — | — |
| Cesanite | Na₃Ca₂(SO₄)₃(OH) | Hexagonal | — | — |
| Cesbronite | Cu₃Te⁶⁺O₄(OH)₄ | Orthorhombic | 3.0 | — |
| Cesiodymite | CsKCu₅O(SO₄)₅ | Triclinic | — | — |
| Cesiokenopyrochlore | ☐ Nb₂(O,OH)₆Cs₁-x | Cubic | — | — |
| Cesplumtantite | (Cs,Na)₂(Pb,Sb³⁺)₃Ta₈O₂₄ | — | — | — |
| Cesàrolite | — | — | 4.5 | — |
| Cetineite | NaK₅Sb₁₄S₆O₁₈·6H₂O | Hexagonal | 3.5 | 4.21 g/cm³ |
| Chabazite-Ca | Ca₂[Al₄Si₈O₂₄]·13H₂O | Trigonal | — | — |
| Chabazite-K | (K₂NaCa₀.₅)[Al₄Si₈O₂₄]·11H₂O | Trigonal | — | — |
| Chabazite-Mg | (Mg₀.₇K₀.₅Ca₀.₅Na₀.₁)[Al₃Si₉O₂₄]·10H₂O | Trigonal | — | — |
| Chabazite-Na | (Na₃K)[Al₄Si₈O₂₄]·11H₂O | Trigonal | — | — |
| Chabazite-Sr | (Sr,Ca)₂[Al₄Si₈O₂₄]·11H₂O | Trigonal | — | — |
| Chabournéite | Tl₄Pb₂(Sb,As)₂₀S₃₄ | Triclinic | — | — |
| Chadwickite | (UO₂)HAsO₃ | Tetragonal | — | — |
| Chaidamuite | ZnFe³⁺(SO₄)₂(OH)·4H₂O | — | — | — |
| Chalcanthite | CuSO₄·5H₂O | Triclinic | 2.5 | — |
| Chalcoalumite | CuAl₄(SO₄)(OH)₁₂ * 3H₂O | Monoclinic | — | — |
| Chalcocite | Cu₂S | Monoclinic | 2.8 | 5.65 g/cm³ |
| Chalcocyanite | CuSO₄ | Orthorhombic | 3.5 | 3.94 g/cm³ |
| Chalcomenite | CuSe⁴⁺O₃·2H₂O | — | — | — |
| Chalconatronite | Na₂Cu(CO₃)₂ * 3H₂O | Monoclinic | — | — |
| Chalcophanite | ZnMn⁴⁺₃O₇·3H₂O | Trigonal | 2.5 | — |
| Chalcophyllite | Cu₁₈Al₂(AsO₄)₄(SO₄)₃(OH)₂₄·36H₂O | Trigonal | 2.0 | — |
| Chalcopyrite | CuFeS₂ | Tetragonal | 3.5 | — |
| Chalcosiderite | CuFe³⁺₆(PO₄)₄(OH)₈·4H₂O | Triclinic | — | — |
| Chalcostibite | CuSbS₂ | Orthorhombic | — | 4.95 g/cm³ |
| Chalcothallite | Tl₂(Cu,Fe)₆SbS₄ | Tetragonal | — | — |
| Challacolloite | KPb₂Cl₅ | Monoclinic | — | — |
| Chambersite | Mn₃B₇O₁₃Cl | Orthorhombic | — | 3.36 g/cm³ |
| Chamosite | (Fe²⁺,Mg,Al,Fe³⁺)₆(Si,Al)₄O₁₀(OH,O)₈ | Monoclinic | 3.0 | — |
| Chanabayaite | Cu₂Cl(N₃C₂H₂)₂(NH₃,Cl,H₂O,☐)₄ | Orthorhombic | — | — |
| Changbaiite | PbNb₂O₆ | Trigonal | 5.5 | — |
| Changchengite | IrBiS | Cubic | 3.5 | 11.96 g/cm³ |
| Changesite-(Ce) | (Ca₈Ce)◻Fe(PO₄)₇ | Trigonal | — | — |
| Changesite-(Y) | (Ca₈Y)◻Fe²⁺(PO₄)₇ | Trigonal | — | — |
| Changoite | Na₂Zn(SO₄)₂·4H₂O | — | — | — |
| Chantalite | CaAl₂(SiO₄)(OH)₄ | Tetragonal | — | — |
| Chaoite | C | Hexagonal | — | — |
| Chapmanite | — | Monoclinic | 2.5 | — |
| Charleshatchettite | CaNb₄O₁₀(OH)₂*₈H₂O | Monoclinic | — | — |
| Charlesite | Ca₆Al₂(SO₄)₂B(OH)₄(OH,O)₁₂·26H₂O | Trigonal | — | — |
| Charmarite | Mn²⁺₄Al₂(OH)₁₂[CO₃] * 3H₂O | — | — | — |
| Charoite | (K,Sr)₁₅-₁₆(Ca,Na)₃₂[Si₆O₁₁(O,OH)₆]₂[Si₁₂O₁₈(O,OH)₁₂]₂[Si₁₇O₂₅(O,OH)₁₈]₂(OH,F)₄ * ~₃H₂O | — | — | — |
| Chatkalite | Cu₆FeSn₂S₈ | Tetragonal | — | — |
| Chayesite | KMg₄Fe³⁺[Si₁₂O₃₀] | — | 6.5 | — |
| Chegemite | Ca₇(SiO₄)₃(OH)₂ | Orthorhombic | — | — |
| Chekhovichite | Bi₂Te₄+₄O₁₁ | — | — | — |
| Chelkarite | CaMgB₂O₄(Cl,OH)₂ * 5H₂O Or near, with Cl:OH = ₃:₁ | — | — | — |
| Chenevixite | CuFe³⁺(AsO₄)(OH)₂ | Monoclinic | — | — |
| Chengdeite | — | Cubic | 5.0 | — |
| Chenguodaite | Ag₉FeTe₂S₄ | Orthorhombic | — | — |
| Chenite | Pb₄Cu(SO₄)₂(OH)₆ | Triclinic | — | — |
| Chenmingite | FeCr₂O₄ | Orthorhombic | — | 4.77 g/cm³ |
| Chenowethite | Mg(H₂O)₆[(UO₂)₂(SO₄)₂(OH)₂]·5H₂O | — | — | — |
| Chenzhangruite | MnFe²⁺Te⁴⁺₄O₁₀ | Tetragonal | — | — |
| Cheralite | CaTh(PO₄)₂ | — | — | — |
| Cheremnykhite | Pb₃Zn₃(VO₄)₂(TeO₆) | Orthorhombic | — | 5.99 g/cm³ |
| Cherepanovite | RhAs | Orthorhombic | — | — |
| Chernikovite | (H₃O)₂(UO₂)₂(PO₄)₂ * 6H₂O | Tetragonal | — | — |
| Chernovite-(Y) | Y(AsO₄) | Tetragonal | — | 4.80 g/cm³ |
| Chernykhite | (Ba,Na)(V³⁺,Al,Mg)₂((Si,Al)₄O₁₀)(OH)₂ | — | — | — |
| Chervetite | Pb₂(V₂O₇) | Monoclinic | — | 6.34 g/cm³ |
| Chesnokovite | Na₂SiO₂(OH)₂·8H₂O | Orthorhombic | — | — |
| Chessexite | Na₄Ca₂Mg₃Al₈(SiO₄)₂(SO₄)₁₀(OH)₁₀·40H₂O | Orthorhombic | — | — |
| Chesterite | Mg₁₇Si₂₀O₅₄(OH)₆ | Orthorhombic | — | — |
| Chestermanite | Mg₂(Fe³⁺,Mg,Al,Sb⁵⁺)O₂(BO₃) | Orthorhombic | — | — |
| Chevkinite-(Ce) | (Ce,La,Ca,Th)₄(Fe²⁺,Mg)(Fe²⁺,Ti,Fe³⁺)₂(Ti,Fe³⁺)₂(Si₂O₇)₂O₈ | Monoclinic | — | — |
| Chiappinoite-(Y) | Y₂Mn(Si₃O₇)₄ | Orthorhombic | — | — |
| Chiavennite | CaMn²⁺(BeOH)₂Si₅O₁₃·(H₂O)₂ | — | — | — |
| Chibaite | SiO₂·n(CH₄,C₂H₆,C₃H₈,C₄H₁₀) (nmax=3/17) | Cubic | — | — |
| Chihmingite | Ni²⁺Al₂O₄ | Cubic | — | — |
| Chihuahuaite | FeAl₁₂O₁₉ | Hexagonal | — | — |
| Childrenite | Fe²⁺AlPO₄(OH)₂·H₂O | Orthorhombic | 5.0 | — |
| Chiluite | Bi₃Te⁶⁺Mo⁶⁺O₁₀.₅ | Hexagonal | — | — |
| Chinchorroite | Na₂Mg₅(As₂O₇)₂(AsO₃OH)₂(H₂O)₁₀ | Triclinic | — | — |
| Chinleite-(Ce) | NaCe(SO₄)₂(H₂O) | Trigonal | — | — |
| Chinleite-(Nd) | — | Trigonal | — | — |
| Chinleite-(Y) | NaY(SO₄)₂·H₂O | Trigonal | — | — |
| Chinnerite | [Mg(H₂O)₆]Na(H₂O)₂Al₃(PO₄)₂F₆ | Monoclinic | — | — |
| Chiolite | Na₅Al₃F₁₄ | Tetragonal | — | 3.10 g/cm³ |
| Chirvinskyite | (Na,Ca)₁₃(Fe,Mn,☐)₂(Ti,Zr)₅(Si₂O₇)₄(OH,O)₁₂*₂H₂O | Triclinic | — | — |
| Chistyakovaite | Al(UO₂)₂(AsO₄)₂F·6.5H₂O | Monoclinic | — | — |
| Chivruaiite | Ca₄(Ti,Nb)₅(Si₆O₁₇)₂(OH,O)₅·13-14H₂O | Orthorhombic | — | — |
| Chiyokoite | Ca3Si(CO3)[B(OH)4]O (OH)5·12H2O | Hexagonal | — | — |
| Chkalovite | Na₂BeSi₂O₆ | — | — | 2.61 g/cm³ |
| Chladniite | Na₂CaMg₇(PO₄)₆ | Trigonal | — | — |
| Chloraluminite | AlCl₃·6H₂O | Trigonal | — | — |
| Chlorapatite | Ca₅(PO₄)₃Cl | Hexagonal | 5.0 | — |
| Chlorargyrite | AgCl | Cubic | 2.5 | 5.58 g/cm³ |
| Chlorartinite | Mg₂CO₃Cl(OH)·2.5H₂O | Trigonal | — | — |
| Chlorbartonite | — | Tetragonal | — | — |
| Chlorellestadite | Ca₅(SiO₄)₁.₅(SO₄)₁.₅Cl | Hexagonal | — | — |
| Chloritoid | (Fe²⁺,Mg,Mn²⁺)Al₂(SiO₄)O(OH)₂ | — | 6.5 | — |
| Chlorkyuygenite | — | Cubic | — | — |
| Chlormagaluminite | Mg₄Al₂(OH)₁₂Cl₂(H₂O)₂ | Hexagonal | — | — |
| Chlormanganokalite | K₄[MnCl₆] | Trigonal | — | — |
| Chlormayenite | Ca₁₂Al₁₄O₃₂[☐₄Cl₂] | Cubic | — | — |
| Chlorocalcite | KCaCl₃ | Orthorhombic | — | — |
| Chloromagnesite | MgCl₂ | Hexagonal | — | 2.28 g/cm³ |
| Chloromenite | Cu₉(SeO₃)₄O₂Cl₆ | — | — | — |
| Chlorophoenicite | (Mn,Mg)₃Zn₂(AsO₄)(OH,O)₆ | Monoclinic | — | — |
| Chlorothionite | K₂Cu(SO₄)Cl₂ | Orthorhombic | — | — |
| Chloroxiphite | Pb₃CuO₂Cl₂(OH)₂ | Monoclinic | — | — |
| Choloalite | (Cu,Sb)₃(Pb,Ca)₃(TeO₃)₆Cl | — | — | — |
| Chondrodite | Mg₅(SiO₄)₂F₂ | Monoclinic | — | 3.09 g/cm³ |
| Chongite | Ca₃Mg₂(AsO₄)₂(AsO₃OH)₂·4H₂O | Monoclinic | — | — |
| Chopinite | (Mg,Fe²⁺)₃(PO₄)₂ | Monoclinic | — | — |
| Chorążewiczite | Pb₂Fe³⁺(Te⁶⁺O₆)(HCO₃) | Trigonal | — | — |
| Chovanite | Pb₁₅₋₂ₓSb₁₄₊₂ₓS₃₆Oₓ (x~0.2) | Monoclinic | — | — |
| Chrisstanleyite | Ag₂Pd₃Se₄ | Monoclinic | — | — |
| Christelite | Zn₃Cu₂(SO₄)₂(OH)₆·4H₂O | Triclinic | — | — |
| Christite | TlHgAsS₃ | Monoclinic | — | — |
| Christofschäferite-(Ce) | (Ce,La,Ca)₄Mn(Ti,Fe)₃(Fe,Ti)(Si₂O₇)₂O₈ | Monoclinic | — | — |
| Chromatite | — | Tetragonal | — | — |
| Chrombismite | Bi₁₆CrO₂₇ | Tetragonal | — | — |
| Chromceladonite | K(Mg,Fe²⁺)(Cr,Al)(Si₄O₁₀)(OH)₂ | Monoclinic | — | — |
| Chromferide | Fe₃Cr₁-x (x=₀.₆) | Cubic | — | — |
| Chromio-pargasite | NaCa₂(Mg₄Cr)(Si₆Al₂)O₂₂(OH)₂ | Monoclinic | — | — |
| Chromite | Fe²⁺Cr₂O₄ | Cubic | 5.5 | — |
| Chromium (native) | Cr | Cubic | — | — |
| Chromium-dravite | Na(Mg₃)Cr³⁺₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH) | Trigonal | — | — |
| Chromo-alumino-povondraite | NaCr₃(Al₄Mg₂)(Si₆O₁₈)(BO₃)₃(OH)₃O | Trigonal | 7.5 | — |
| Chromphyllite | K(Cr,Al)₂(AlSi₃O₁₀)(OH,F)₂ | — | — | — |
| Chromschieffelinite | Pb₁₀Te⁶⁺₆O₂₀(OH)₁₄(CrO₄)(H₂O)₅ | Orthorhombic | — | — |
| Chromviskontite | Pb₅Cu₂(CrO₄)₃(SeO₃)(OH)₆ | Orthorhombic | — | — |
| Chrysoberyl | BeAl₂O₄ | Orthorhombic | 8.5 | 3.71 g/cm³ |
| Chrysocolla | Cu₂₋ₓAlₓ(H₂₋ₓSi₂O₅)(OH)₄ · nH₂O | Orthorhombic | — | — |
| Chrysothallite | K₆Cu₆Tl³⁺Cl₁₇(OH)₄·H₂O | Tetragonal | — | — |
| Chrysotile | Mg₃Si₂O₅(OH)₄ | Orthorhombic | — | 2.49 g/cm³ |
| Chubarovite | KZn₂(BO₃)Cl₂ | Trigonal | — | — |
| Chudobaite | (Mg,Zn)₅(AsO₄)₂(HAsO₄)₂ * 10H₂O | Triclinic | — | — |
| Chukanovite | Fe₂(CO₃)(OH)₂ | Monoclinic | — | — |
| Chukhrovite-(Ca) | Ca₃Ca₁.₅Al₂(SO₄)F₁₃·12H₂O | Cubic | — | — |
| Chukhrovite-(Ce) | Ca₃CeAl₂(SO₄)F₁₃·12H₂O | Cubic | — | — |
| Chukhrovite-(Nd) | Ca₃NdAl₂(SO₄)F₁₃·12H₂O | Cubic | — | — |
| Chukhrovite-(Y) | Ca₃YAl₂(SO₄)F₁₃·10H₂O | Cubic | — | — |
| Chukochenite | — | Orthorhombic | 8.0 | — |
| Chukotkaite | — | Monoclinic | — | — |
| Churchite-(Y) | YPO₄·2H₂O | — | 3.0 | — |
| Chursinite | (Hg+₂)₀.₅Hg²⁺(AsO₄) | — | — | — |
| Chvaleticeite | Mn(SO₄)(H₂O)₆ | Monoclinic | — | — |
| Chvilevaite | Na(Cu,Fe,Zn)₂S₄ | — | — | — |
| Cianciulliite | Mg₂Mn²⁺Zn₂(OH)₁₀·2-4H₂O | — | — | — |
| Cinnabar | HgS | Trigonal | 2.3 | 8.10 g/cm³ |
| Ciprianiite | Ca₄(ThREE)AlSi₄B₄O₂₂(OH)₂ | — | — | — |
| Ciriottiite | Cu(Cu,Ag)₃Pb₁₉(Sb,As)₂₂(As₂)S₅₆ | Monoclinic | — | — |
| Cirrolite | Ca₃Al₂(PO₄)₃(OH)₃ | — | — | — |
| Clairite | (NH₄)₂Fe³⁺₃(SO₄)₄(OH)₃·3H₂O | Triclinic | — | — |
| Claraite | (Cu,Zn)₁₅(CO₃)₄(AsO₄)₂(SO₄)(OH)₁₄*₇H₂O | Trigonal | 2.0 | — |
| Claringbullite | Cu₄ClF(OH)₆ | Hexagonal | — | — |
| Clarkeite | (Na,Ca,Pb)(UO₂)O(OH) * ₀-₁H₂O | Trigonal | — | — |
| Claudetite | As₂O₃ | Monoclinic | — | — |
| Clausthalite | PbSe | Cubic | — | 8.05 g/cm³ |
| Clearcreekite | (Hg+₂)₁.₅(CO₃)(OH) * 2H₂O | Monoclinic | — | — |
| Clerite | MnSb₂S₄ | Orthorhombic | — | — |
| Cleusonite | (Pb,Sr)(U₄+,U₆+)(Fe²⁺,Zn)₂(Ti,Fe²⁺,Fe³⁺)₁₈(O,OH)₃₈ | Trigonal | — | — |
| Cliffordite | UTe⁴⁺₃O₉ | — | — | — |
| Clino-ferri-holmquistite | ☐Li₂(Mg₃Fe³⁺₂)Si₈O₂₂(OH)₂ | Monoclinic | — | — |
| Clino-ferro-ferri-holmquistite | ☐Li₂(Fe²⁺₃Fe³⁺₂)Si₈O₂₂(OH)₂ | Monoclinic | — | — |
| Clino-oscarkempffite | Ag₁₅Pb₆Sb₂₁Bi₁₈S₇₂ | Monoclinic | — | — |
| Clino-suenoite | ☐Mn₂²⁺Mg₅Si₈O₂₂(OH)₂ | Monoclinic | — | — |
| Clinoatacamite | Cu₂(OH)₃Cl | Monoclinic | 3.0 | — |
| Clinobehoite | Be(OH)₂ | Monoclinic | — | — |
| Clinobisvanite | Bi(VO₄) | Monoclinic | — | 7.07 g/cm³ |
| Clinocervantite | Sb³⁺Sb₅+O₄ | Monoclinic | — | — |
| Clinochlore | Mg₅Al(AlSi₃O₁₀)(OH)₈ | Monoclinic | — | — |
| Clinoclase | Cu₃AsO₄(OH)₃ | Monoclinic | — | — |
| Clinoenstatite | MgSiO₃ | Monoclinic | — | — |
| Clinofergusonite-(Ce) | CeNbO₄ | — | — | 6.05 g/cm³ |
| Clinofergusonite-(Nd) | NdNbO₄ | Monoclinic | — | 6.18 g/cm³ |
| Clinofergusonite-(Y) | YNbO₄ | Monoclinic | — | 5.47 g/cm³ |
| Clinoferrosilite | Fe²⁺SiO₃ | Monoclinic | — | — |
| Clinohedrite | CaZn(SiO₄) * H₂O | Monoclinic | — | — |
| Clinohumite | Mg₉(SiO₄)₄F₂ | Monoclinic | 6.0 | — |
| Clinojimthompsonite | (Mg,Fe)₅Si₆O₁₆(OH)₂ | Monoclinic | — | — |
| Clinokurchatovite | Ca(Mg,Fe²⁺,Mn²⁺)[B₂O₅] | Monoclinic | — | — |
| Clinometaborite | HBO₂ | Monoclinic | — | 2.10 g/cm³ |
| Clinophosinaite | Na₁₂(Ca,Sr)₄(Si₄O₁₂)(PO₄)₄ | Monoclinic | — | — |
| Clinoptilolite-Ca | Ca₃(Si₃₀Al₆)O₇₂*₂₀H₂O | Monoclinic | — | — |
| Clinoptilolite-K | K₆(Si₃₀Al₆)O₇₂*₂₀H₂O | Monoclinic | — | — |
| Clinoptilolite-Na | Na₆(Si₃₀Al₆)O₇₂*₂₀H₂O | Monoclinic | — | — |
| Clinosafflorite | CoAs₂ | Monoclinic | — | 7.55 g/cm³ |
| Clinosulphur | S | Monoclinic | — | — |
| Clinotobermorite | Ca₄Si₆O₁₇(H₂O)₂·(Ca·3H₂O) | Monoclinic | — | — |
| Clinoungemachite | (Na, K, Fe, SO₄) | Monoclinic | — | — |
| Clinozoisite | Ca₂Al₃(Si₂O₇)(SiO₄)O(OH) | Monoclinic | — | — |
| Clintonite | CaAlMg₂(SiAl₃)O₁₀(OH)₂ | Monoclinic | — | — |
| Clogauite | PbBi₄Te₄S₃ | Trigonal | — | — |
| Cloncurryite | Cu₀.₅(VO)₀.₅Al₂(PO₄)₂F₂·5H₂O | Monoclinic | — | — |
| Cloudite | BaFe³⁺₃(PO₄)(SO₄)(OH)₆ | Trigonal | — | — |
| Coalingite | Mg₁₀Fe³⁺₂(CO₃)(OH)₂₄·2H₂O | Trigonal | — | — |
| Cobaltarthurite | (Co,Mg)Fe³⁺₂(AsO₄)₂(OH)₂ * 4H₂O | — | — | — |
| Cobaltaustinite | CaCo(AsO₄)(OH) | Orthorhombic | — | — |
| Cobaltite | CoAsS | Orthorhombic | 5.5 | 6.26 g/cm³ |
| Cobaltkieserite | Co(SO₄)(H₂O) | Monoclinic | — | — |
| Cobaltkoritnigite | Co(AsO₃OH)·H₂O | Triclinic | — | — |
| Cobaltlotharmeyerite | CaCo₂(AsO₄)₂·2H₂O | — | 4.5 | 4.13 g/cm³ |
| Cobaltneustädtelite | — | — | 4.5 | — |
| Cobaltoblödite | Na₂Co(SO₄)₂·4H₂O | Monoclinic | — | — |
| Cobaltomenite | CoSe⁴⁺O₃·2H₂O | — | — | — |
| Cobaltpentlandite | Co₉S₈ | Cubic | — | 5.70 g/cm³ |
| Cobalttsumcorite | PbCo₂(AsO₄)₂·2H₂O | — | — | 5.31 g/cm³ |
| Cobaltzippeite | Co(UO₂)₂(SO₄)O₂ * 3.₅H₂O | Monoclinic | — | — |
| Coccinite | HgI₂ | Tetragonal | 2.0 | 5.89 g/cm³ |
| Cochromite | (Co,Ni,Fe)(Cr,Al)₂O₄ | Cubic | — | — |
| Coconinoite | Fe³⁺₂Al₂(UO₂)₂(PO₄)₄(SO₄)(OH)₂·20H₂O | — | — | — |
| Coesite | SiO₂ | Monoclinic | — | 2.63 g/cm³ |
| Coffinite | U(SiO₄) * nH₂O | Tetragonal | — | — |
| Cohenite | Fe₃C | Orthorhombic | — | — |
| Coiraite | (Pb,Sn)₁₂.₅As₃Sn₅FeS₂₈ | Monoclinic | — | — |
| Colchesterite | Bi³⁺₂Mo⁶⁺₂O₉ | Monoclinic | — | — |
| Coldwellite | Pd₃Ag₂S | Cubic | — | — |
| Colemanite | CaB₃O₄(OH)₃·H₂O | Monoclinic | 4.5 | — |
| Colimaite | K₃VS₄ | Orthorhombic | — | 2.21 g/cm³ |
| Colinowensite | BaCuSi₂O₆ | Tetragonal | — | — |
| Collinsite | Ca₂Mg(PO₄)₂·2H₂O | Triclinic | — | — |
| Colomeraite | NaTi³⁺Si₂O₆ | Monoclinic | — | — |
| Coloradoite | HgTe | Cubic | — | 7.65 g/cm³ |
| Colquiriite | CaLiAlF₆ | Trigonal | — | 2.86 g/cm³ |
| Columbite-(Fe) | Fe²⁺Nb₂O₆ | Orthorhombic | — | — |
| Columbite-(Mg) | MgNb₂O₆ | Orthorhombic | — | 4.89 g/cm³ |
| Columbite-(Mn) | Mn²⁺Nb₂O₆ | Orthorhombic | — | — |
| Colusite | Cu₁₂VAs₃S₁₆ | Cubic | — | — |
| Comancheite | Hg²⁺₅₅N³⁻₂₄(NH₂,OH)₄(Cl,Br)₃₄ | Orthorhombic | — | — |
| Combeite | Na₂Ca₂Si₃O₉ | Trigonal | — | — |
| Comblainite | Ni₄Co³⁺₂(CO₃)(OH)₁₂·3H₂O | Trigonal | — | — |
| Compreignacite | K₂(UO₂)₆O₄(OH)₆·7H₂O | Orthorhombic | — | — |
| Congolite | (Fe²⁺,Mg)₃(B₇O₁₃)Cl | Trigonal | — | — |
| Conichalcite | CaCuAsO₄(OH) | Orthorhombic | 4.5 | — |
| Connellite | Cu₃₆(SO₄)(OH)₆₂Cl₈·6H₂O | Hexagonal | 3.0 | — |
| Cookeite | (Al,Li)₃Al₂(Si,Al)₄O₁₀(OH)₈ | — | — | — |
| Coombsite | K(Mn,Fe,Mg)₁₃(Si,Al)₁₈O₄₂(OH)₁₄ | — | — | — |
| Cooperite | PtS | Tetragonal | — | 10.10 g/cm³ |
| Coparsite | Cu₄(AsO₄,VO₄)O₂Cl | Orthorhombic | — | — |
| Copiapite | Fe²⁺Fe³⁺₄(SO₄)₆(OH)₂·20H₂O | Triclinic | — | — |
| Coquandite | Sb³⁺₆₊ₓO₈₊ₓ(SO₄)(OH)ₓ·H₂O₁₋ₓ (x = 0.3) | Triclinic | — | — |
| Coquimbite | — | Trigonal | 2.0 | — |
| Coralloite | Mn²⁺Mn³⁺₂(AsO₄)₂(OH)₂·4H₂O | Triclinic | — | — |
| Corderoite | Hg²⁺₃S₂Cl₂ | Cubic | — | — |
| Cordierite | Mg₂Al₄Si₅O₁₈ | Orthorhombic | — | 2.42 g/cm³ |
| Cordylite-(Ce) | (Na,Ca,☐)BaCe₂(CO₃)₄(F,O) | Hexagonal | 4.5 | — |
| Cordylite-(La) | NaCaBa₂La₃Sr(CO₃)₈F₂ | Hexagonal | — | — |
| Corkite | PbFe³⁺₃(SO₄)(PO₄)(OH)₆ | Trigonal | — | — |
| Cornetite | Cu₃PO₄(OH)₃ | Orthorhombic | — | — |
| Cornubite | Cu₅(AsO₄)₂(OH)₄ | Triclinic | 4.0 | — |
| Cornwallite | Cu₅(AsO₄)₂(OH)₄ | Monoclinic | 4.5 | — |
| Coronadite | Pb(Mn⁴⁺₆Mn³⁺₂)O₁₆ | Monoclinic | — | — |
| Correianevesite | Fe²⁺Mn²⁺₂(PO₄)₂·3H₂O | Orthorhombic | — | — |
| Corrensite | (Mg,Fe)₉((Si,Al)₈O₂₀)(OH)₁₀ * nH₂O | — | — | — |
| Cortesognoite | CaV₂Si₂O₇(OH)₂·H₂O | Orthorhombic | — | — |
| Corundum | Al₂O₃ | Trigonal | 9.0 | — |
| Corvusite | (Na,Ca,K)₁₋ₓ(V⁵⁺,V⁴⁺,Fe²⁺)₈O₂₀·4H₂O | Monoclinic | — | — |
| Cosalite | Pb₂Bi₂S₅ | Orthorhombic | — | — |
| Coskrenite-(Ce) | (Ce,Nd,La)₂(C₂O₄)(SO₄)₂ * 12H₂O | Triclinic | — | 2.88 g/cm³ |
| Cossaite | (Mg₀.₅,☐)Al₆(SO₄)₆(HSO₄)F₆·36H₂O | Trigonal | — | — |
| Costibite | CoSbS | — | — | 7.02 g/cm³ |
| Cotunnite | PbCl₂ | Orthorhombic | 2.5 | 5.77 g/cm³ |
| Coulsonite | Fe²⁺V³⁺₂O₄ | Cubic | — | — |
| Cousinite | MgU₂Mo₂O₁₁ * 6H₂O | — | — | — |
| Coutinhoite | Th_{x}Ba_(₁-₂x)(UO₂)₂Si₅O₁₃ * (H₂O)₁+y | — | — | — |
| Covellite | CuS | Hexagonal | — | — |
| Cowlesite | Ca(Al₂Si₃)O₁₀·(5-6)H₂O | Orthorhombic | 5.0 | — |
| Coyoteite | NaFe₃S₅·2H₂O | Triclinic | — | — |
| Crandallite | CaAl₃(PO₄)(PO₃OH)(OH)₆ | Trigonal | 5.0 | — |
| Cranswickite | Mg(SO₄)·4H₂O | Monoclinic | — | — |
| Crawfordite | Na₃Sr(CO₃)(PO₄) | Monoclinic | — | — |
| Creaseyite | Cu₂Pb₂Fe³⁺₂Si₅O₁₇·6H₂O | Orthorhombic | — | — |
| Crednerite | CuMnO₂ | Monoclinic | — | 5.44 g/cm³ |
| Creedite | Ca₃Al₂(SO₄)(OH)₂F₈·2H₂O | Monoclinic | 4.0 | — |
| Crerarite | Pt₂-x(Bi,Pb)₁₁(S,Se)₁₁ | Triclinic | — | — |
| Crichtonite | Sr(Mn,Y,U)Fe₂(Ti,Fe,Cr,V)₁₈(O,OH)₃₈ | — | — | — |
| Crimsonite | PbFe³⁺₂(PO₄)₂(OH)₂ | Orthorhombic | — | — |
| Cristobalite | SiO₂ | Tetragonal | 6.5 | 2.63 g/cm³ |
| Crocobelonite | — | Orthorhombic | — | — |
| Crocoite | PbCrO₄ | Monoclinic | — | 6.11 g/cm³ |
| Cronstedtite | Fe²⁺₂Fe³⁺((Si,Fe³⁺)₂O₅)(OH)₄ | — | 3.5 | — |
| Cronusite | Ca₀.₂CrS₂ * ₂ H₂O | — | — | — |
| Crookesite | Cu₇TlSe₄ | Tetragonal | — | — |
| Crowningshieldite | (Ni₀.₉Fe₀.₁₀)S | Hexagonal | — | — |
| Cryobostryxite | KZnCl₃·2H₂O | Monoclinic | — | — |
| Cryolite | Na₃AlF₆ | Monoclinic | — | 3.06 g/cm³ |
| Cryolithionite | Na₃Al₂(LiF₄)₃ | Cubic | — | 2.87 g/cm³ |
| Cryptochalcite | K₂Cu₅O(SO₄)₅ | Triclinic | — | — |
| Cryptohalite | (NH₄)₂SiF₆ | Cubic | — | 2.01 g/cm³ |
| Cryptomelane | K(Mn⁴⁺₇Mn³⁺)O₁₆ | Monoclinic | — | — |
| Cryptophyllite | K₂Ca[Si₄O₁₀]·5H₂O | Monoclinic | — | — |
| Cualstibite | Cu₂Al(OH)₆[Sb₅+(OH)₆] | Trigonal | — | — |
| Cuatrocapaite-(K) | K₃(NaMg☐)(As₂O₃)₆Cl₆(H₂O)₁₆ | Trigonal | — | — |
| Cuatrocapaite-(NH4) | (NH₄)₃(NaMg☐)(As₂O₃)₆Cl₆·(H₂O)₁₆ | Trigonal | — | — |
| Cubanite | CuFe₂S₃ | Orthorhombic | 3.5 | — |
| Cubo-ice | — | Cubic | — | — |
| Cuboargyrite | AgSbS₂ | — | — | 5.04 g/cm³ |
| Cubothioplumbite | — | Cubic | — | — |
| Cumengeite | Pb₂₁Cu₂₀Cl₄₂(OH)₄₀·6H₂O | — | 2.5 | 4.66 g/cm³ |
| Cummingtonite | ☐Mg₂Mg₅Si₈O₂₂(OH)₂ | Monoclinic | — | — |
| Cupalite | CuAl | Orthorhombic | — | 5.51 g/cm³ |
| Cuprite | Cu₂O | Cubic | — | — |
| Cuproauride | Cu₃Au | Cubic | — | 12.35 g/cm³ |
| Cuprobismutite | Cu₈AgBi₁₃S₂₄ | — | — | — |
| Cuprocherokeeite | [Pb₈Zn₃Cu2+(OH)16](SO₄)₄·4H₂O | — | — | — |
| Cuprocopiapite | CuFe₄(SO₄)₆(OH)₂ * 20H₂O | — | — | — |
| Cuprodobrovolskyite | Na₄Cu(SO₄)₃ | — | — | — |
| Cuprodongchuanite | Pb₄CuZn₂(PO₄)₄(OH)₂ | Triclinic | — | — |
| Cuproiridsite | Cu(Ir³⁺Ir⁴⁺)S₄ | Cubic | — | — |
| Cuprokalininite | Cu(Cr³⁺Cr⁴⁺)S₄ | Cubic | — | — |
| Cupromakopavonite | Cu₈Pb₄Ag₃Bi₁₉S₃₈ | Monoclinic | — | — |
| Cupromakovickyite | Cu₄AgPb₂Bi₉S₁₈ | Monoclinic | — | — |
| Cupromolybdite | Cu²⁺₃O(Mo⁶⁺O₄)₂ | Orthorhombic | — | — |
| Cuproneyite | Cu₇Pb₂₇Bi₂₅S₆₈ | Monoclinic | — | — |
| Cupropavonite | Cu₀.₉Ag₀.₅Pb₀.₆Bi₂.₅S₅ | Monoclinic | — | — |
| Cupropearceite | [Cu₆As₂S₇][Ag₉CuS₄] | Trigonal | — | — |
| Cupropolybasite | [Cu₆Sb₂S₇][Ag₉CuS₄] | Trigonal | — | — |
| Cuprorhodsite | (Cu₁+₀.₅Fe³⁺₀.₅)Rh³⁺₂S₄ | Cubic | 5.0 | — |
| Cuprorivaite | CaCuSi₄O₁₀ | Tetragonal | — | — |
| Cuprosenandorite | Ag₁₆Cu₈Pb₂₄Sb₇₂S₁₄₄ | Orthorhombic | — | — |
| Cuprosklodowskite | Cu(UO₂)₂(SiO₃OH)₂·6H₂O | Triclinic | 4.0 | — |
| Cuprospinel | Cu²⁺Fe³⁺₂O₄ | Cubic | — | — |
| Cuprostibite | Cu₂(Sb,Tl) | Tetragonal | — | — |
| Cuprotungstite | Cu₂(WO₄)(OH)₂ | Tetragonal | — | — |
| Cuprozheshengite | Pb₄CuZn₂(AsO₄)₂(PO₄)₂(OH)₂ | Triclinic | — | — |
| Curetonite | Ba(Al,Ti)(PO₄)(OH,O)F | Monoclinic | — | — |
| Curienite | Pb(UO₂)₂(VO₄)₂·5H₂O | Orthorhombic | 3.0 | — |
| Curite | Pb₃(UO₂)₈O₈(OH)₆ * 3H₂O | Orthorhombic | — | — |
| Currierite | Na₄Ca₃MgAl₄(AsO₃OH)₁₂·9H₂O | Hexagonal | — | — |
| Cuspidine | Ca₈(Si₂O₇)₂F₄ | Monoclinic | — | — |
| Cuzticite | Fe³⁺₂Te⁶⁺O₆·3H₂O | Hexagonal | — | — |
| Cyanochroite | K₂Cu(SO₄)₂ * 6H₂O | — | — | — |
| Cyanotrichite | Cu₄Al₂SO₄(OH)₁₂·2H₂O | Orthorhombic | 2.0 | — |
| Cylindrite | FePb₃Sn₄Sb₂S₁₄ | Triclinic | 2.5 | — |
| Cymrite | BaAl₂Si₂(O,OH)₈ * H₂O | Monoclinic | — | — |
| Cyprine | Ca₁₉Cu²⁺(Al₁₀Mg₂)Si₁₈O₆₈(OH)₁₀ | Tetragonal | — | — |
| Cyrilovite | NaFe³⁺₃(PO₄)₂(OH)₄ * 2H₂O | Tetragonal | — | — |
| Czochralskiite | Na₄Ca₃Mg(PO₄)₄ | Orthorhombic | — | — |
| Cámaraite | Ba₃Na(Fe²⁺)₈Ti₄(Si₂O₇)₄O₄(OH)₄F₃ | Triclinic | — | — |
| Césarferreiraite | Fe²⁺Fe³⁺₂(AsO₄)₂(OH)₂·8H₂O | Triclinic | — | — |
| Čechite | — | Orthorhombic | — | — |
| Čejkaite | — | Triclinic | — | — |
| Černýite | Cu₂CdSnS₄ | Tetragonal | 4.0 | 4.66 g/cm³ |