| Raadeite | Mg₇(PO₄)₂(OH)₈ | Monoclinic | — | 2.71 g/cm³ |
| Rabbittite | Ca₃Mg₃(UO₂)₂(CO₃)₆(OH)₄·18H₂O | Monoclinic | 2.5 | — |
| Rabejacite | Ca₂[(UO₂)₄O₄(SO₄)₂](H₂O)₈ | Orthorhombic | — | — |
| Raberite | Tl₅Ag₄As₆SbS₁₅ | Triclinic | — | — |
| Radekškodaite-(Ce) | — | Monoclinic | — | — |
| Radekškodaite-(La) | — | Monoclinic | — | — |
| Radhakrishnaite | PbTe₃(Cl,S)₂ | Tetragonal | — | — |
| Radovanite | Cu₂Fe³⁺(AsO₄)(HAs³⁺O₃)₂ * H₂O | — | — | — |
| Radtkeite | Hg²⁺₃S₂ICl | Orthorhombic | — | — |
| Radvaniceite | GeS₂ | Monoclinic | — | — |
| Raguinite | TlFeS₂ | Orthorhombic | — | — |
| Raisaite | CuMg[Te⁶⁺O₄(OH)₂]·6H₂O | Monoclinic | — | — |
| Raite | — | Orthorhombic | 3.0 | — |
| Rajite | Cu(Te₄+₂O₅) | Monoclinic | — | — |
| Rakovanite | Na₃{H₃[V₁₀O₂₈]}·15H₂O | Monoclinic | — | — |
| Ralphcannonite | AgZn₂TlAs₂S₆ | Tetragonal | — | — |
| Ramaccioniite | Cu₄[SeO₄](OH)₆ | — | — | — |
| Ramanite-(Cs) | CsB₅O₆(OH)₄·2H₂O | Monoclinic | — | — |
| Ramanite-(Rb) | RbB₅O₆(OH)₄·2H₂O | Orthorhombic | — | — |
| Ramazzoite | [Mg₈Cu₁₂(PO₄)(CO₃)₄(OH)₂₄(H₂O)₂₀][(H₀.₃₃SO₄)₃(H₂O)₃₆] | — | — | — |
| Rambergite | MnS | Hexagonal | 4.0 | 4.19 g/cm³ |
| Ramdohrite | Pb₅.₉Fe₀.₁Mn₀.₁In₀.₁Cd₀.₂Ag₂.₈Sb₁₀.₈S₂₄ | Monoclinic | 2.0 | — |
| Rameauite | K₂Ca(H[₃]₂O)(H[₅]₂O)₄[(UO₂)₆O₆(OH)₄](H[₄]₂O) | Monoclinic | — | — |
| Ramikite-(Y) | Li₄(Na,Ca)₁₂(Y,Ca,REE)₆Zr₆(PO₄)₁₂(CO₃)₄O₄[(OH),F]₄ | Triclinic | — | — |
| Rammelsbergite | NiAs₂ | Orthorhombic | — | 7.11 g/cm³ |
| Ramosite | — | Monoclinic | — | — |
| Ramsbeckite | (Cu,Zn)₁₅(SO₄)₄(OH)₂₂·6H₂O | Monoclinic | 3.5 | — |
| Ramsdellite | Mn⁴⁺O₂ | Orthorhombic | 3.0 | — |
| Ranciéite | (Ca,Mn²⁺)₀.₂(Mn⁴⁺,Mn³⁺)O₂·0.6H₂O | Trigonal | — | — |
| Rankachite | Ca₀.₅(V₄+,V₅+)(W₆+,Fe³⁺)₂O₈(OH) * 2H₂O | Monoclinic | — | — |
| Rankamaite | (Na,K)₃(Ta,Nb,Al)₁₁(O,OH)₃₁ | Orthorhombic | — | — |
| Rankinite | Ca₃Si₂O₇ | Monoclinic | — | — |
| Ransomite | CuFe₂(SO₄)₄ * 6H₂O | Monoclinic | — | — |
| Ranunculite | HAl(UO₂)(PO₄)(OH)₃·4H₂O | — | — | — |
| Rapidcreekite | Ca₂(SO₄)(CO₃)·4H₂O | Orthorhombic | — | — |
| Rappoldite | PbCo₂(AsO₄)₂·2H₂O | Triclinic | 4.5 | 5.28 g/cm³ |
| Raslakite | Na₁₅Ca₃Fe²⁺₃(Na,Zr)₃Zr₃(Si,Nb)[(Si₃O₉)₂(Si₉O₂₇)₂SiO](OH,H₂O)₃(Cl,OH) | Trigonal | — | — |
| Rasmussenite | Ca(C₂H₃O₃)₂·3H₂O | Triclinic | — | — |
| Raspite | PbWO₄ | Tetragonal | — | 8.32 g/cm³ |
| Rastsvetaevite | Na₂₇K₈Ca₁₂Fe₃Zr₆Si₅₂O₁₄₄(O,OH,H₂O)₆Cl₂ | Trigonal | — | — |
| Rasvumite | KFe₂S₃ | Orthorhombic | — | 3.18 g/cm³ |
| Rathite | Ag₂Pb₁₂₋ₓTlₓ/₂As₁₈₊ₓ/₂S₄₀ | — | 3.0 | — |
| Rathite-IV | Pb₃As₅S₁₀ | Monoclinic | — | — |
| Rauchite | Ni(UO₂)₂(AsO₄)₂·10H₂O | Triclinic | — | — |
| Raudseppite | Ba₂Ca₇(Si₃O₉)₂(CO₃)₂Cl₂ | Triclinic | — | — |
| Rauenthalite | Ca₃(AsO₄)₂ * 10H₂O | — | — | — |
| Rauvite | Ca(UO₂)₂(V₁₀O₂₈) * 16H₂O | — | — | — |
| Ravatite | C₁₄H₁₀ | Monoclinic | 1.0 | 1.11 g/cm³ |
| Raydemarkite | — | Triclinic | — | — |
| Raygrantite | Pb₁₀Zn(SO₄)₆(SiO₄)₂(OH)₂ | Triclinic | — | — |
| Rayite | (Ag,Tl)₂Pb₈Sb₈S₂₁ | — | — | 6.13 g/cm³ |
| Realgar | AsS | Monoclinic | — | 3.26 g/cm³ |
| Reaphookhillite | MgZn₂(PO₄)₂·4H₂O | Triclinic | — | — |
| Rebulite | Tl₅Sb₅As₈S₂₂ | — | — | — |
| Reckibachite | Ag₂Pb₁₂As₁₄Sb₄S₄₀ | Monoclinic | — | — |
| Rectorite | (Na,Ca)Al₄((Si,Al)₈O₂₀)(OH)₄ * 2H₂O | — | — | — |
| Redcanyonite | (NH₄)₂Mn[(UO₂)₄O₄(SO₄)₂](H₂O)₄ | Monoclinic | — | — |
| Reddingite | Mn²⁺₃(PO₄)₂·3H₂O | Orthorhombic | — | — |
| Redgillite | Cu₆(SO₄)(OH)₁₀·H₂O | Monoclinic | — | — |
| Redingtonite | (Fe²⁺,Mg,Ni)(Cr,Al)₂(SO₄)₄*₂₂H₂O | Monoclinic | — | — |
| Redledgeite | Ba(Ti⁴⁺₆Cr³⁺₂)O₁₆ | — | — | — |
| Redmondite | — | Monoclinic | — | — |
| Redondite | Al(PO₄)·2H₂O | — | — | — |
| Reederite-(Y) | (Na,Mn)₁₅Y₂(CO₃)₉(FSO₃)Cl | Hexagonal | — | — |
| Reedmergnerite | NaBSi₃O₈ | Triclinic | 6.3 | 2.78 g/cm³ |
| Reevesite | Ni₆Fe³⁺₂(OH)₁₆(CO₃) * 4H₂O | Trigonal | 2.0 | — |
| Refikite | C₂₀H₃₂O₂ | Orthorhombic | — | — |
| Regerite | KFe₆(PO₄)₄(OH)₇(H₂O)₆·4H₂O | Monoclinic | — | — |
| Reichenbachite | Cu₅(PO₄)₂(OH)₄ | Monoclinic | 3.5 | 4.37 g/cm³ |
| Reidite | ZrSiO₄ | Tetragonal | — | 4.63 g/cm³ |
| Reinerite | Zn₃(As³⁺O₃)₂ | Orthorhombic | — | — |
| Reinhardbraunsite | Ca₅(SiO₄)₂(OH,F)₂ | Monoclinic | — | — |
| Relianceite-(K) | — | Monoclinic | — | — |
| Renardite | Pb(UO₂)₄(PO₄)₂(OH)₄·7H₂O | — | — | — |
| Rengeite | Sr₄Ti₄ZrO₈(Si₂O₇)₂ | Monoclinic | — | — |
| Renierite | (Cu¹⁺,Zn)₁₁Fe₄(Ge⁴⁺,As⁵⁺)₂S₁₆ | Tetragonal | — | — |
| Reppiaite | Mn²⁺₅(VO₄)₂(OH)₄ | — | — | — |
| Retgersite | NiSO₄ * 6H₂O | Tetragonal | — | — |
| Retzian-(Ce) | Mn²⁺₂Ce(AsO₄)(OH)₄ | Orthorhombic | — | — |
| Retzian-(La) | (Mn²⁺,Mg)₂(La,Ce,Nd)(AsO₄)(OH)₄ | — | — | — |
| Retzian-(Nd) | Mn²⁺₂(Nd,Ce,La)(AsO₄)(OH)₄ | — | — | — |
| Revdite | Na₁₆Si₁₆O₂₇(OH)₂₆ * 2₈H₂O | — | — | — |
| Rewitzerite | [K(H₂O)]Mn₂(Al₂Ti)(PO₄)₄[O(OH)](H₂O)₁₀·4H₂O | Monoclinic | — | — |
| Reyerite | Na₂Ca₁₄Al₂Si₂₂O₅₈(OH)₈·6H₂O | — | — | — |
| Reynoldsite | Pb₂Mn⁴⁺₂O₅(CrO₄) | Triclinic | — | — |
| Reznitskyite | — | Monoclinic | — | — |
| Rhabdoborite-(V) | Mg₁₂(V₅+,Mo₆+,W₆+)₁ * 5O₆{[BO₃]₆-x[(P,As)O₄]xF₂-x} (x < ₁) | Hexagonal | — | — |
| Rhabdoborite-(W) | Mg₁₂(W₆+,V₅+)₁ * 5O₆{[BO₃]₆–x[(P,As)O₄]xF₂–x} (x < ₁) | Hexagonal | — | — |
| Rhabdophane-(Ce) | CePO₄·H₂O | Trigonal | — | — |
| Rhabdophane-(La) | La(PO₄)·H₂O | Hexagonal | 3.5 | — |
| Rhabdophane-(Nd) | NdPO₄·H₂O | Hexagonal | — | — |
| Rhabdophane-(Y) | Y(PO₄)·H₂O | Hexagonal | — | — |
| Rheniite | ReS₂ | Triclinic | — | 7.11 g/cm³ |
| Rhenium (native) | Re | Hexagonal | — | — |
| Rhodarsenide | Rh₂As | Orthorhombic | — | — |
| Rhodesite | KHCa₂Si₈O₁₉·5H₂O | — | — | — |
| Rhodium (native) | (Rh, Pt) | Cubic | 3.5 | — |
| Rhodizite | KBe₄Al₄(B₁₁Be)O₂₈ | Cubic | — | — |
| Rhodochrosite | MnCO₃ | Trigonal | — | 3.74 g/cm³ |
| Rhodonite | CaMn₃Mn(Si₅O₁₅) | Triclinic | — | — |
| Rhodostannite | Cu₂FeSn₃S₈ | Tetragonal | — | — |
| Rhodplumsite | Rh₃Pb₂S₂ | Trigonal | — | 9.79 g/cm³ |
| Rhomboclase | (H₅O₂)Fe³⁺(SO₄)₂ * 2H₂O | Orthorhombic | — | — |
| Rhönite | — | Triclinic | — | — |
| Ribbeite | Mn²⁺₅(SiO₄)₂(OH)₂ | — | — | — |
| Richardsite | — | Tetragonal | — | — |
| Richardsollyite | TlPbAsS₃ | Monoclinic | — | — |
| Richellite | CaFe³⁺₂(PO₄)₂(OH,F)₂ | Tetragonal | — | — |
| Richelsdorfite | Ca₂Cu₅Sb(AsO₄)₄(OH)₆Cl * 6H₂O | Monoclinic | — | — |
| Richetite | (Fe³⁺,Mg)Pb ₈.₆(UO₂)₃₆O₃₆(OH)₂₄*₄₁H₂O | — | — | — |
| Richterite | Na(NaCa)Mg₅Si₈O₂₂(OH)₂ | Monoclinic | — | — |
| Rickardite | Cu₃₋ₓTe₂ | Orthorhombic | — | — |
| Rickturnerite | Pb₇O₄[Mg(OH)₄](OH)Cl₃ | Orthorhombic | — | — |
| Riebeckite | ☐Na₂(Fe²⁺₃Fe³⁺₂)Si₂O₂₂(OH)₂ | Monoclinic | 6.0 | — |
| Riesite | TiTiO₄ | Monoclinic | — | — |
| Rietveldite | Fe(UO₂)(SO₄)₂(H₂O)₅ | Orthorhombic | 2.0 | — |
| Rigrahamite | Na₂Ca₂Th₂(CO₃)₄(HCO₃)₂(OH)₄(H₂O)₇ | Monoclinic | — | — |
| Rilandite | Cr₆SiO₁₁·5H₂O (?) | — | — | — |
| Rimkorolgite | (Mg,Mn)₅(Ba,Sr,Ca)(PO₄)₄ * 8H₂O | — | — | — |
| Ringwoodite | SiMg₂O₄ | Cubic | — | 3.24 g/cm³ |
| Rinkite-(Ce) | (Ca₃REE)Na(NaCa)Ti(Si₂O₇)₂(OF)F₂ | Monoclinic | — | — |
| Rinkite-(Y) | Na₂Ca₄YTi(Si₂O₇)₂OF₃ | Monoclinic | — | — |
| Rinmanite | ZnSb⁵⁺(Fe³⁺₂Mg)O₇(OH) | Hexagonal | — | — |
| Rinneite | K³NaFe²⁺Cl₆ | — | 3.0 | 2.35 g/cm³ |
| Riomarinaite | Bi(SO₄)(OH) * H₂O | Monoclinic | — | — |
| Riotintoite | Al(SO₄)(OH)*₃H₂O | Triclinic | — | — |
| Rippite | K₂(Nb,Ti)₂(Si₄O₁₂)O(O,F) | Tetragonal | — | — |
| Rittmannite | (Mn²⁺,Ca)Mn²⁺(Fe²⁺,Mn²⁺,Mg)₂(Al,Fe³⁺)₂(PO₄)₄(OH)₂(H₂O)₈ | Monoclinic | — | — |
| Rivadavite | Na₆Mg[B₆O₇(OH)₆]₄ * 10H₂O | Monoclinic | — | — |
| Riversideite | Ca₅Si₆O₁₆(OH)₂·2H₂O | — | — | — |
| Roaldite | (Fe,Ni)₄N | Cubic | — | — |
| Robertsite | Ca₂Mn³⁺₃(PO₄)₃O₂(H₂O)₂·H₂O | Monoclinic | — | — |
| Robinsonite | Pb₄Sb₆S₁₃ | Monoclinic | — | — |
| Rockbridgeite | Fe²⁺Fe³⁺₄(PO₄)₃(OH)₅ | — | — | — |
| Rodalquilarite | Fe₂(TeO₂OH)₃(TeO₃)Cl | Triclinic | — | — |
| Rodolicoite | Fe³⁺PO₄ | Trigonal | — | — |
| Roeblingite | Ca₆Mn²⁺Pb₂(Si₃O₉)₂(SO₄)₂(OH)₂·4H₂O | Monoclinic | — | — |
| Roedderite | KNaMg₂(Mg₃Si₁₂)O₃₀ | Hexagonal | 6.5 | — |
| Rogermitchellite | Na₆Sr₁₂Ba₂Zr₁₃Si₃₉B₄O₁₂₃(OH)₆·20H₂O | Hexagonal | — | — |
| Roggianite | Ca₂Be(OH)₂Al₂Si₄O₁₃ * 2.₅H₂O | Tetragonal | — | — |
| Rohaite | (Tl,Pb,K)₂Cu₈.₇Sb₂S₄ | Orthorhombic | — | — |
| Rokühnite | — | Monoclinic | — | — |
| Rollandite | Cu₃(AsO₄)₂ * 4H₂O | Orthorhombic | — | — |
| Romanorlovite | K₈Cu₆Cl₁₇(OH)₃ | Tetragonal | — | — |
| Romanèchite | (Ba,H₂O)₂(Mn⁴⁺,Mn³⁺)₅O₁₀ | Monoclinic | — | — |
| Romarchite | SnO | Tetragonal | — | 6.29 g/cm³ |
| Rondorfite | Ca₈Mg(SiO₄)₄Cl₂ | Cubic | — | — |
| Rongibbsite | Pb₂(Si₄Al)O₁₁(OH) | Monoclinic | — | — |
| Ronneburgite | K₂MnV₄O₁₂ | Monoclinic | 3.0 | 2.66 g/cm³ |
| Ronpetersonite | BaWO₄ | Tetragonal | — | 6.25 g/cm³ |
| Rooseveltite | BiAsO₄ | Tetragonal | — | 7.62 g/cm³ |
| Roquesite | CuInS₂ | Tetragonal | — | 4.75 g/cm³ |
| Rorisite | CaFCl | Tetragonal | — | — |
| Rosasite | CuZnCO₃(OH)₂ | Monoclinic | 4.5 | — |
| Roscherite | Ca₂Mn²⁺₅Be₄(PO₄)₆(OH)₄ * 6H₂O | — | — | — |
| Roscoelite | K(V³⁺,Al)₂(AlSi₃O₁₀)(OH)₂ | Monoclinic | 2.5 | — |
| Roselite | Ca₂Co(AsO₄)₂·2H₂O | Monoclinic | 3.5 | — |
| Rosemaryite | (Na,Ca,Mn)(Mn,Fe²⁺)(Fe³⁺,Mg)Al(PO₄)₃ | Monoclinic | — | — |
| Rosenbergite | AlF₃.3H₂O | Tetragonal | — | — |
| Rosenbuschite | Ca₆Zr₂Na₆ZrTi(Si₂O₇)₄(OF)₂F₄ | Triclinic | — | — |
| Rosenhahnite | HCa₃[Si₃O₉(OH)] | Triclinic | — | — |
| Roshchinite | (Ag,Cu)₁₉Pb₁₀Sb₅₁S₉₆ | Orthorhombic | — | — |
| Rosiaite | PbSb₂O₆ | Trigonal | — | 6.89 g/cm³ |
| Rosickýite | S | Monoclinic | — | — |
| Rosièresite | [Pb,Cu,Al,PO₄,H₂O] (?) | Amorphous | — | — |
| Rossiantonite | Al₃(PO₄)(SO₄)₂(OH)₂(H₂O)₁₀·4H₂O | Triclinic | — | — |
| Rossite | Ca(VO₃)₂·4H₂O | Triclinic | — | — |
| Rossmanite | ☐(LiAl₂)Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH) | Trigonal | 7.0 | — |
| Rossovskyite | (Fe³⁺,Ta)(Nb,Ti)O₄ | Monoclinic | — | — |
| Rostite | AlSO₄(OH)·5H₂O | Orthorhombic | — | — |
| Rotemite | Ca₄Cr₂(OH)₁₂Cl₂·4H₂O | Trigonal | — | — |
| Roterbärite | PdCuBiSe₃ | Orthorhombic | — | 7.23 g/cm³ |
| Rotherkopfite | KNa₂Fe²⁺(Fe²⁺)₂(Ti₁.₅Fe²⁺₀.₅)[Si₄O₁₂]₂ | Monoclinic | — | — |
| Rouaite | Cu₂(NO₃)(OH)₃ | Monoclinic | — | — |
| Roubaultite | Cu₂(UO₂)₃(CO₃)₂O₂(OH)₂*₄H₂O | Triclinic | — | — |
| Roumaite | (Nb,Ti)(Ca,Na,☐)₃(Ca,REE)₄(Si₂O₇)₂(OH)F₃ | Monoclinic | — | — |
| Rouseite | Pb₂Mn²⁺[AsO₃]₂ * 2H₂O | Triclinic | — | — |
| Routhierite | CuTlHg₂As₂S₆ | Tetragonal | — | — |
| Rouvilleite | Na₃Ca₂(CO₃)₃F | Monoclinic | — | — |
| Rouxelite | Cu₂HgPb₂₃Sb₂₇S₆₅.₅ | — | — | — |
| Roweite | Ca₂Mn²⁺₂B₄O₇(OH)₆ | Orthorhombic | — | — |
| Rowlandite-(Y) | (Y,Ce)₄Fe²⁺(Si₂O₇)₂F₂ (?) | Triclinic | — | — |
| Rowleyite | [Na(NH₄,K)₉Cl₄][V₅+,₄+₂(P,As)O₈]₆*n[H₂O,Na,NH₄,K,Cl] | Cubic | — | — |
| Roxbyite | Cu₉S₅ | Triclinic | — | — |
| Roymillerite | Pb₂₄Mg₉(Si₁₀O₂₈)(CO₃)₁₀(BO₃)(SiO₄)(OH)₁₃O₅ | Triclinic | — | 5.97 g/cm³ |
| Rozenite | FeSO₄ * 4H₂O | Monoclinic | — | — |
| Rozhdestvenskayaite-(Zn) | Ag₆(Ag₄Zn₂)Sb₄S₁₂S | Cubic | — | — |
| Rruffite | Ca₂Cu(AsO₄)₂·2H₂O | Monoclinic | — | — |
| Ruarsite | (Ru,Os)AsS | Monoclinic | — | — |
| Rubicline | Rb(AlSi₃O₈) | Triclinic | 6.0 | — |
| Rubinite | Ca₃Ti³⁺₂Si₃O₁₂ | Cubic | — | — |
| Rucklidgeite | PbBi₂Te₄ | — | — | — |
| Rudabányaite | — | Cubic | — | — |
| Rudashevskyite | (Fe,Zn)S | Cubic | — | 3.79 g/cm³ |
| Rudenkoite | Sr₃(Al₃.₅Si₃.₅)O₁₀(OH,O)₈Cl₂ * H₂O | Monoclinic | — | — |
| Rudolfhermannite | — | Hexagonal | — | — |
| Ruifrancoite | Ca₂(☐,Mn)₂(Fe³⁺,Mn,Mg)₄Be₄(PO₄)₆(OH)₆·4H₂O | — | — | — |
| Ruitenbergite | Ca₉B₂₆O₃₄(OH)₂₄Cl₄ * 13H₂O | Monoclinic | — | — |
| Ruizhongite | (Ag₂◻)Pb₃Ge₂S₈ | — | — | — |
| Ruizite | Ca₂Mn³⁺₂[Si₄O₁₁(OH)₂](OH)₂*₂H₂O | Monoclinic | — | — |
| Rumoiite | AuSn₂ | Orthorhombic | — | — |
| Rumseyite | [Pb₂OF]Cl | Tetragonal | — | — |
| Rundqvistite-(Ce) | Na₃(Sr₃Ce)[Zn₂Si₈O₂₄] | Monoclinic | — | — |
| Rusakovite | (Fe³⁺,Al)₅(VO₄,PO₄)₂(OH)₉ * 3H₂O | — | — | — |
| Rusinovite | Ca₁₀(Si₂O₇)₃Cl₂ | Orthorhombic | — | — |
| Russellite | Bi₂WO₆ | Orthorhombic | — | 9.34 g/cm³ |
| Russoite | (NH₄)ClAs₂O₃(H₂O)₀.₅ | Hexagonal | — | — |
| Rustenburgite | Pt₃Sn | Cubic | 5.0 | 17.87 g/cm³ |
| Rustumite | Ca₁₀(Si₂O₇)₂(SiO₄)(OH)₂Cl₂ | Monoclinic | — | — |
| Ruthenarsenite | (Ru,Ni)As | — | — | 10.00 g/cm³ |
| Rutheniridosmine | (Ir,Os,Ru) | Hexagonal | — | 20.49 g/cm³ |
| Ruthenium (native) | Ru | Hexagonal | — | — |
| Rutherfordine | (UO₂)CO₃ | Orthorhombic | — | — |
| Rutile | TiO₂ | Tetragonal | — | 3.86 g/cm³ |
| Rynersonite | CaTa₂O₆ | — | — | 7.37 g/cm³ |
| Rémondite-(Ce) | Na₃(Ce,Ca,Na)₃(CO₃)₅ | Monoclinic | — | — |
| Rémondite-(La) | Na₃(La,Ca,Na)₃(CO₃)₅ | Monoclinic | — | — |
| Ríosecoite | — | Triclinic | — | — |
| Römerite | — | Triclinic | — | — |
| Röntgenite-(Ce) | Ca₂Ce₃(CO₃)₅F₃ | Trigonal | — | — |
| Rüdlingerite | — | Monoclinic | — | — |