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- Orthorhombic
Orthorhombic crystal system
1,001 minerals
| Mineral | Chemical formula | Mohs hardness | Density |
|---|---|---|---|
| Wulffite | K₃NaCu₄O₂(SO₄)₄ | — | — |
| Wyartite | CaU₅+(UO₂)₂(CO₃)O₄(OH) * 7H₂O | — | — |
| Wölsendorfite | Pb₇(UO₂)₁₄O₁₉(OH)₄·12H₂O | 5.0 | — |
| Wülfingite | — | — | — |
| Xieite | Fe²⁺Cr₂O₄ | — | — |
| Xocomecatlite | Cu₃(Te⁶⁺O₄)(OH)₄ | 4.0 | — |
| Yakovenchukite-(Y) | K₃NaCaY₂Si₁₂O₃₀·4H₂O | — | — |
| Yakubovichite | CaNi₂Fe³⁺(PO₄)₃ | — | — |
| Yanomamite | In(AsO₄)·2H₂O | — | — |
| Yaroslavite | Ca₃Al₂F₁₀(OH)₂·H₂O | — | — |
| Yeite | TiSi | — | 4.27 g/cm³ |
| Yeomanite | Pb₂O(OH)Cl | — | — |
| Yftisite-(Y) | — | — | — |
| Yingjiangite | K₂Ca(UO₂)₇(PO₄)₄(OH)₆·6H₂O | — | — |
| Yttrocolumbite-(Y) | (Y,U,Fe²⁺)(Nb,Ta)O₄ | — | — |
| Yttrotantalite-(Y) | (Y,U,Fe²⁺)(Ta,Nb)(O,OH)₄ | — | — |
| Yuanfuliite | Mg(Fe³⁺,Al)O(BO₃) | — | — |
| Yukonite | Ca₂Fe³⁺₃(AsO₄)₃(OH)₄·4H₂O | — | — |
| Yurgensonite | K₂SnTiO₂(AsO₄)₂ | — | — |
| Zangboite | TiFeSi₂ | — | 5.20 g/cm³ |
| Zektzerite | NaLiZrSi₆O₁₅ | 6.0 | 2.67 g/cm³ |
| Zellerite | Ca(UO₂)(CO₃)₂ * 5H₂O | 2.0 | — |
| Zhiqinite | — | — | — |
| Zhonghongite | Cu₂₉(As,Sb)₁₂S₃₃ | — | — |
| Zimbabweite | (Na,K)₂PbAs₄(Ta,Nb,Ti)₄O₁₈ | — | — |
| Zincolibethenite | CuZnPO₄OH | 4.0 | — |
| Zincolivenite | CuZnAsO₄(OH) | — | — |
| Zincomenite | ZnSeO₃ | — | 4.74 g/cm³ |
| Zincorietveldite | Zn(UO₂)(SO₄)₂(H₂O)₅ | — | — |
| Zinkosite | ZnSO₄ | — | 3.93 g/cm³ |
| Zirconolite | CaZrTi₂O₇ | — | — |
| Zircosulfate | (Zr,Ti)(SO₄)₂ * 4H₂O | — | — |
| Znamenskyite | Pb₄In₂Bi₄S₁₃ | — | 6.44 g/cm³ |
| Zoisite | Ca₂Al₃(Si₂O₇)(SiO₄)O(OH) | 6.5 | — |
| Zoisite-(Pb) | — | — | — |
| Zorite | Na₆Ti₅Si₁₂O₃₄(O,OH)₅·11H₂O | — | — |
| Zoubekite | AgPb₄Sb₄S₁₀ | — | — |
| Zuktamrurite | FeP₂ | — | 5.21 g/cm³ |
| Zýkaite | — | — | — |
| Ángelaite | Cu₂AgPbBiS₄ | — | — |
| Čechite | — | — | — |