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Triclinic crystal system
516 minerals
| Mineral | Chemical formula | Mohs hardness | Density |
|---|---|---|---|
| Weilite | Ca(AsO₃OH) | — | — |
| Weissbergite | TlSbS₂ | 1.5 | 5.81 g/cm³ |
| Weloganite | Na₂Sr₃Zr(CO₃)₆·3H₂O | 3.5 | — |
| Welshite | Ca₄Mg₉Sb₃O₄[Si₆Be₃AlFe₂O₃₆] | 6.0 | — |
| Werdingite | (Mg,Fe)₂Al₁₄Si₄B₄O₃₇ | — | — |
| Wernerbaurite | {(NH₄)₂[Ca₂(H₂O)₁₄]₂(H₂O)₂}{V₁₀O₂₈} | — | — |
| Wheatleyite | Na₂Cu(C₂O₄)₂·2H₂O | — | — |
| Wilcoxite | MgAl(SO₄)₂F * 17H₂O | — | — |
| Wilkinsonite | Na₂Fe²⁺₄Fe³⁺₂(Si₆O₁₈)O₂ | — | — |
| Willhendersonite | KCa[Al₃Si₃O₁₂] * 5H₂O | — | — |
| Wollastonite | CaSiO₃ | — | 2.90 g/cm³ |
| Wonesite | (Na,K)(Mg,Fe,Al)₆((Al,Si)₄O₁₀)₂(OH,F)₄ | — | — |
| Wycheproofite | NaAlZr(PO₄)₂(OH)₂·H₂O | — | — |
| Xanthoxenite | Ca₄Fe³⁺₂(PO₄)₄(OH)₂·3H₂O | — | — |
| Xenophyllite | Na₄Fe₇(PO₄)₆ | — | — |
| Yancowinnaite | PbCuAl(AsO₄)₂OH·H₂O | 3.0 | — |
| Yangite | PbMnSi₃O₈·H₂O | — | — |
| Yaroshevskite | Cu₉O₂(VO₄)₄Cl₂ | — | — |
| Yeatmanite | Zn₆Mn²⁺₉Sb⁵⁺₂O₁₂(SiO₄)₄ | — | — |
| Yoshimuraite | Ba₄(Mn²⁺)₄Ti₂(Si₂O₇)₂(PO₄)₂O₂(OH)₂ | — | — |
| Yuchuanite-(Y) | Y₂(CO₃)₃·H₂O | — | — |
| Yvonite | Cu(AsO₃OH)·2H₂O | — | — |
| Zaherite | Al₁₂(SO₄)₅(OH)₂₆·20H₂O | 3.5 | — |
| Zheshengite | Pb₄ZnZn₂(AsO₄)₂(PO₄)₂(OH)₂ | — | — |
| Zigrasite | MgZr(PO₄)₂·4H₂O | — | — |
| Ziminaite | Fe³⁺₆(VO₄)₆ | — | — |
| Zincgartrellite | PbZn₂(AsO₄)₂(H₂O,OH)₂ | 4.5 | 5.30 g/cm³ |
| Zincocopiapite | ZnFe³⁺₄(SO₄)₆(OH)₂ * 18H₂O | — | — |
| Zincostrunzite | ZnFe³⁺₂(PO₄)₂(OH)₂*₆.₅H₂O | — | — |
| Zinkgruvanite | — | — | — |
| Zircophyllite | K₂NaFe²⁺₇Zr₂(Si₄O₁₂)₂O₂(OH)₄F | — | — |
| Znucalite | CaZn₁₁(UO₂)(CO₃)₃(OH)₂₀·4H₂O | — | — |
| Zvyaginite | (Na☐)Nb₂Zn☐₂Ti(Si₂O₇)₂O₂[O(OH)][(OH)F](H₂O)₅ | — | — |
| Écrinsite | — | — | — |
| Čejkaite | — | — | — |
| Żabińskiite | — | — | — |