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Tetragonal crystal system
372 minerals
| Mineral | Chemical formula | Mohs hardness | Density |
|---|---|---|---|
| Abernathyite | K(UO₂)(AsO₄)·3H₂O | — | — |
| Abswurmbachite | Cu²⁺(Mn³⁺)₆O₈(SiO₄) | 6.5 | 4.96 g/cm³ |
| Adranosite | (NH₄)₄NaAl₂(SO₄)₄Cl(OH)₂ | — | — |
| Adranosite-(Fe) | (NH₄)₄NaFe₂(SO₄)₄Cl(OH)₂ | — | — |
| Alfredcasparite | Sr₂TiO(Si₂O₇) | — | — |
| Alumovesuvianite | Ca₁₉Al(Al₁₀Mg₂)Si₁₈O₆₉(OH)₉ | — | — |
| Alumoåkermanite | (Ca,Na)₂(Al,Mg,Fe²⁺)(Si₂O₇) | — | — |
| Aminoffite | Ca₃(BeOH)₂Si₃O₁₀ | — | 2.83 g/cm³ |
| Ammonioleucite | (NH₄)AlSi₂O₆ | — | — |
| Ammoniomathesiusite | (NH₄)₅(UO₂)₄(SO₄)₄(VO₅)₄·H₂O | — | — |
| Anatase | TiO₂ | — | 3.90 g/cm³ |
| Andymcdonaldite | Fe₂TeO₆ | — | 6.39 g/cm³ |
| Anningite-(Ce) | — | — | — |
| Anyuiite | AuPb₂ | — | 12.88 g/cm³ |
| Apuanite | Fe²⁺Fe³⁺₄Sb³⁺₄O₁₂S | — | — |
| Arapovite | — | — | — |
| Archerite | H₂KPO₄ | — | 2.39 g/cm³ |
| Armellinoite-(Ce) | Ca₄Ce₄+(AsO₄)₄·H₂O | — | — |
| Arsenohauchecornite | Ni₁₈Bi₃AsS₁₆ | — | — |
| Arsenotučekite | — | — | — |
| Arsenudinaite | NaMg₄(AsO₄)₃ | — | 3.83 g/cm³ |
| Arsiccioite | AgHg₂TlAs₂S₆ | — | — |
| Arzamastsevite | K₆Al₅Si₆O₂₀(OH)₄Cl | — | — |
| Ashburtonite | HCu₄Pb₄Si₄O₁₂(HCO₃)₄(OH)₄Cl | — | — |
| Ashcroftine-(Y) | K₅Na₅Y₁₂Si₂₈O₇₀(OH)₂(CO₃)₈·8H₂O | — | — |
| Ashoverite | Zn(OH)₂ | — | 3.20 g/cm³ |
| Asisite | Pb₇SiO₈Cl₂ | — | — |
| Atelisite-(Y) | Y₄Si₃O₈(OH)₈ | — | — |
| Atlasovite | K(BiO)Cu₆Fe³⁺(SO₄)₅O₃Cl | — | — |
| Babefphite | BaBePO₄F | — | 4.33 g/cm³ |
| Babunaite-(Nd) | NdAsO₄ | — | 6.16 g/cm³ |
| Bandylite | Cu[B(OH)₄]Cl | 2.5 | — |
| Bariopharmacosiderite | Ba₀.₅Fe³⁺₄(AsO₄)₃(OH)₄ * 5H₂O | — | — |
| Barquillite | Cu₂CdGeS₄ | — | 4.62 g/cm³ |
| Bartonite | — | — | — |
| Bavsiite | Ba₂V₂O₂[Si₄O₁₂] | — | — |
| Bellidoite | Cu₂Se | — | — |
| Bennesherite | — | — | — |
| Biphosphammite | (NH₄)H₂(PO₄) | — | — |
| Bismoclite | BiOCl | — | — |
| Bismutohauchecornite | Ni₉Bi₂S₈ | — | — |
| Bortnikovite | Pd₄Cu₃Zn | — | — |
| Braggite | PtS | 6.0 | 10.10 g/cm³ |
| Braunite | Mn²⁺Mn³⁺₆(Si₈O₄) | — | — |
| Briartite | Cu₂FeGeS₄ | 4.5 | — |
| Bukovite | Cu₄Tl₂Se₄ | — | — |
| Butianite | Ni₆SnS₂ | — | — |
| Byströmite | MgSb⁵⁺₂O₆ | 7.0 | — |
| Béhierite | — | — | — |
| Cabvinite | Th₂F₇(OH)·3H₂O | — | — |
| Cahnite | Ca₂[B(OH)₄](AsO₄) | 3.0 | — |
| Calomel | HgCl | — | 6.92 g/cm³ |
| Cameronite | Cu₅₋ₓ (Cu,Ag)₃₊ₓTe₁₀(with x=0.43) | — | — |
| Caminite | Mg₇(SO₄)₅(OH)₄·H₂O | — | — |
| Cassiterite | SnO₂ | 6.5 | 6.58 g/cm³ |
| Cerchiaraite-(Al) | Ba₄Al₄(Si₄O₁₂)O₂(OH)₄Cl₂[Si₂O₃(OH)₄] | — | — |
| Cerchiaraite-(Fe) | Ba₄Fe³⁺₄(Si₄O₁₂)O₂(OH)₄Cl₂[Si₂O₃(OH)₄] | — | — |
| Cerchiaraite-(Mn) | Ba₄Mn³⁺₄(Si₄O₁₂)O₂(OH)₄Cl₂[Si₂O₃(OH)₄] | — | — |
| Chadwickite | (UO₂)HAsO₃ | — | — |
| Chalcopyrite | CuFeS₂ | 3.5 | — |
| Chalcothallite | Tl₂(Cu,Fe)₆SbS₄ | — | — |
| Chantalite | CaAl₂(SiO₄)(OH)₄ | — | — |
| Chatkalite | Cu₆FeSn₂S₈ | — | — |
| Chenzhangruite | MnFe²⁺Te⁴⁺₄O₁₀ | — | — |
| Chernikovite | (H₃O)₂(UO₂)₂(PO₄)₂ * 6H₂O | — | — |
| Chernovite-(Y) | Y(AsO₄) | — | 4.80 g/cm³ |
| Chiolite | Na₅Al₃F₁₄ | — | 3.10 g/cm³ |
| Chlorbartonite | — | — | — |
| Chromatite | — | — | — |
| Chrombismite | Bi₁₆CrO₂₇ | — | — |
| Chrysothallite | K₆Cu₆Tl³⁺Cl₁₇(OH)₄·H₂O | — | — |
| Coccinite | HgI₂ | 2.0 | 5.89 g/cm³ |
| Coffinite | U(SiO₄) * nH₂O | — | — |
| Colinowensite | BaCuSi₂O₆ | — | — |
| Cooperite | PtS | — | 10.10 g/cm³ |
| Cristobalite | SiO₂ | 6.5 | 2.63 g/cm³ |
| Crookesite | Cu₇TlSe₄ | — | — |
| Cuprorivaite | CaCuSi₄O₁₀ | — | — |
| Cuprostibite | Cu₂(Sb,Tl) | — | — |
| Cuprotungstite | Cu₂(WO₄)(OH)₂ | — | — |