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Tetragonal crystal system
372 minerals
| Mineral | Chemical formula | Mohs hardness | Density |
|---|---|---|---|
| Tugtupite | Na₄BeAlSi₄O₁₂Cl | 4.0 | 2.46 g/cm³ |
| Tulameenite | CuFePt₂ | — | — |
| Tunisite | NaCa₂Al₄(CO₃)₄(OH)₈Cl | — | — |
| Turkestanite | (K,☐)(Ca,Na)₂ThSi₈O₂₀·nH₂O | — | — |
| Udinaite | NaMg₄(VO₄)₃ | — | 3.26 g/cm³ |
| Umangite | Cu₃Se₂ | 3.0 | 6.70 g/cm³ |
| Ungavaite | Pd₄Sb₃ | — | — |
| Uramarsite | (NH₄)(UO₂)(AsO₄)·3H₂O | — | — |
| Uramphite | NH₄(UO₂)PO₄·3H₂O | — | — |
| Uranocircite | Ba(UO₂)₂(PO₄)₂·10H₂O | — | 3.46 g/cm³ |
| Uranospinite | Ca(UO₂)₂(AsO₄)₂·10H₂O | — | — |
| Urea | CO(NH₂)₂ | — | — |
| Urvantsevite | Pd(Bi,Pb)₂ | 2.0 | 9.66 g/cm³ |
| Varlamoffite | (Sn,Fe)(O,OH)₂ | — | — |
| Velikite | Cu₂HgSnS₄ | 4.0 | 5.46 g/cm³ |
| Vesuvianite | (Ca,Na)₁₉(Al,Mg,Fe)₁₃(SiO₄)₁₀(Si₂O₇)₄(OH,F,O)₁₀ | 6.5 | — |
| Vincentite | Pd₃As | — | 10.65 g/cm³ |
| Viteite | Pd₅InAs | — | 10.56 g/cm³ |
| Vlodavetsite | AlCa₂(SO₄)₂F₂Cl * 4H₂O | — | — |
| Wakefieldite-(Ce) | Ce(VO₄) | — | — |
| Wakefieldite-(La) | La(VO₄) | 4.0 | 4.62 g/cm³ |
| Wakefieldite-(Nd) | NdVO₄ | — | 4.93 g/cm³ |
| Wakefieldite-(Y) | Y(VO₄) | — | 4.22 g/cm³ |
| Wardite | NaAl₃(PO₄)₂(OH)₄·2H₂O | 5.0 | — |
| Weddellite | Ca(C₂O₄)·2H₂O | 4.0 | — |
| Wesselsite | SrCuSi₄O₁₀ | — | — |
| Wiluite | Ca₁₉(Al,Mg)₁₃(B,☐,Al)₅(Si₂O₇)₄(SiO₄)₁₀(O,OH)₁₀ | 6.0 | 3.36 g/cm³ |
| Wiserite | Mn²⁺₁₄(B₂O₅)₄(OH)₈·(Si,Mg)(O,OH)₄Cl | 2.5 | — |
| Wulfenite | PbMoO₄ | 3.0 | 6.75 g/cm³ |
| Wuyanzhiite | Cu₂S | — | — |
| Xenotime-(Gd) | Gd(PO₄) | — | — |
| Xenotime-(Y) | Y(PO₄) | — | 4.27 g/cm³ |
| Xenotime-(Yb) | Yb(PO₄) | — | 6.56 g/cm³ |
| Xiangjiangite | Fe³⁺(UO₂)₄(PO₄)₂(SO₄)₂(OH)·22H₂O | — | — |
| Xianhuaite-(Ce) | K₂CeNb₅O₁₅ | — | — |
| Xianhuaite-(La) | K₂LaNb₅O₁₅ | — | — |
| Yecoraite | Fe³⁺₃Bi₅O₉(Te⁴⁺O₃)(Te⁶⁺O₄)₂·9H₂O | — | — |
| Zaccariniite | RhNiAs | — | 10.00 g/cm³ |
| Zapatalite | Cu₃Al₄(PO₄)₃(OH)₉ * 4H₂O | 1.5 | — |
| Zavaritskite | BiOF | — | — |
| Zeunerite | Cu(UO₂)₂(AsO₄)₂·12H₂O | 2.5 | — |
| Zhangpeishanite | BaFCl | — | — |
| Zhaoyuanite | MnZnTe⁴⁺₄O₁₀ | — | — |
| Zinclipscombite | ZnFe³⁺₂(PO₄)₂(OH)₂ | — | — |
| Zincobriartite | Cu₂(Zn,Fe)(Ge,Ga)S₄ | — | — |
| Zincostottite | ZnGe(OH)₆ | — | — |
| Zircon | ZrSiO₄ | 7.5 | 4.65 g/cm³ |
| Ziroite | ZrO₂ | — | 5.78 g/cm³ |
| Zuolinite | Ba₂Sr(Nb₄.₅Fe³⁺₀.₅)O₁₅ | — | — |
| Åkermanite | Ca₂MgSi₂O₇ | — | — |
| Černýite | Cu₂CdSnS₄ | 4.0 | 4.66 g/cm³ |
| Štěpite | U(AsO₃OH)₂·4H₂O | — | — |