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Monoclinic crystal system
1,774 minerals
| Mineral | Chemical formula | Mohs hardness | Density |
|---|---|---|---|
| Watatsumiite | Na₂KLi(Mn²⁺,Fe²⁺)₂V₄+₂[Si₈O₂₄] | — | — |
| Waterhouseite | Mn₇(PO₄)₂(OH)₈ | — | — |
| Watkinsonite | Cu₂PbBi₄(Se,S,Te)₈ | — | — |
| Wattersite | (Hg+₂)₂Hg²⁺(CrO₄)O₂ | — | — |
| Wawayandaite | Ca₆Mn₂BBe₉Si₆O₂₃(OH,Cl)₁₅ | — | — |
| Weeksite | K₂(UO₂)₂(Si₅O₁₃) * 4H₂O | — | 4.10 g/cm³ |
| Weinebeneite | CaBe₃(PO₄)₂(OH)₂ * 4H₂O | — | — |
| Wendwilsonite | Ca₂Mg(AsO₄)₂·2H₂O | — | — |
| Wenqingite | Pb₅(AsS₃)₂(Ge₂S₆) | — | — |
| Wetherillite | Na₂Mg(UO₂)₂(SO₄)₄·18H₂O | — | — |
| Wherryite | Pb₇Cu₂(SO₄)₄(SiO₄)₂(OH)₂ | — | — |
| Whewellite | Ca(C₂O₄)·H₂O | — | — |
| Whiteite-(CaFeMg) | CaFe²⁺Mg₂Al₂(PO₄)₄(OH)₂(H₂O)₈ | — | — |
| Whiteite-(CaMgMg) | CaMg₃Al₂(PO₄)₄(OH)₂·2H₂O | — | — |
| Whiteite-(CaMnMg) | CaMn²⁺Mg₂Al₂(PO₄)₄(OH)₂(H₂O)₈ | — | — |
| Whiteite-(CaMnMn) | CaMn²⁺Mn²⁺₂Al₂(PO₄)₄(OH)₂·8H₂O | — | — |
| Whiteite-(MnFeMg) | Mn²⁺Fe²⁺Mg₂Al₂(PO₄)₄(OH)₂(H₂O)₈ | — | — |
| Whiteite-(MnMnMg) | MnMnMg₂Al₂(PO₄)₄(OH)₂ * 8H₂O | — | — |
| Whiteite-(MnMnMn) | — | — | — |
| Whiterockite | — | — | — |
| Whitmoreite | Fe²⁺Fe³⁺₂(PO₄)₂(OH)₂ * 4H₂O | 3.0 | — |
| Widgiemoolthalite | Ni₅(CO₃)₄(OH)₂·4-5H₂O | — | — |
| Wightmanite | Mg₅(BO₃)O(OH)₅ * 2H₂O | — | — |
| Wilhelmkleinite | ZnFe³⁺₂(AsO₄)₂(OH)₂ | 4.5 | 4.36 g/cm³ |
| Wilkmanite | Ni₃Se₄ | — | — |
| Willemseite | Ni₃Si₄O₁₀(OH)₂ | 2.0 | 3.31 g/cm³ |
| Winchite | ☐(NaCa)(Mg₄Al)Si₈O₂₂(OH)₂ | — | — |
| Windhoekite | Ca₂Fe³⁺₃₋ₓ[Si₈O₂₀](OH)₄·10H₂O | — | — |
| Windmountainite | ☐Fe³⁺₂Mg₂☐₂Si₈O₂0(OH)₂∙8H₂O | — | — |
| Wittite | Pb₉Bi₁₂(S,Se)₂₇ | — | — |
| Witzkeite | Na₄K₄Ca(NO₃)₂(SO₄)₄·2H₂O | 2.0 | — |
| Wodginite | Mn²⁺Sn⁴⁺Ta₂O₈ | — | — |
| Wolfeite | (Fe²⁺,Mn²⁺)₂(PO₄)(OH) | — | — |
| Wolfsriedite | Pb[(UO₂)₂(W⁶⁺Fe³⁺)O₇(OH)](H₂O)₃ | — | — |
| Woodruffite | Zn²⁺x/₂(Mn₄+₁-xMn³⁺x)O₂*yH₂O | — | — |
| Wroewolfeite | Cu₄(SO₄)(OH)₆ * 2H₂O | — | — |
| Wupatkiite | (Co,Mg,Ni)Al₂(SO₄)₄*₂₂H₂O | — | — |
| Wyllieite | (Na,Ca,Mn)(Mn,Fe)(Fe,Mg)Al(PO₄)₃ | — | — |
| Wöhlerite | — | — | — |
| Xanthiosite | Ni₃(AsO₄)₂ | 4.0 | 5.56 g/cm³ |
| Xanthoconite | Ag₃AsS₃ | — | 5.39 g/cm³ |
| Xiexiandeite | SiO₂ | — | 2.63 g/cm³ |
| Xilingolite | Pb₃Bi₂S₆ | — | 6.96 g/cm³ |
| Xitieshanite | Fe³⁺(SO₄)Cl·6H₂O | — | — |
| Xocolatlite | Ca₂Mn⁴⁺₂Te⁶⁺₂O₁₂·H₂O | — | — |
| Xonotlite | Ca₆Si₆O₁₇(OH)₂ | — | — |
| Yakhontovite | (Ca,Na,K)₀.₂(Cu,Fe,Mg)₂(Si₄O₁₀)(OH)₂·3H₂O | — | — |
| Yamhamelachite | KCrP₂O₇ | — | 2.94 g/cm³ |
| Yangzhumingite | KMg₂.₅Si₄O₁₀F₂ | — | — |
| Yarzhemskiite | K[B₅O₇(OH)₂]·H₂O | — | — |
| Yavapaiite | KFe³⁺(SO₄)₂ | — | — |
| Yazganite | ☐NaMgFe³⁺₂(AsO₄)₃·H₂O | 5.0 | — |
| Yegorovite | Na₄[Si₂O₄(OH)₂]₂·7H₂O | — | — |
| Yoderite | (MgAl₃)(MgAl)Al₂O₂(SiO₄)₄(OH)₂ | 6.0 | — |
| Yofortierite | Mn²⁺₅Si₈O₂₀(OH)₂·7H₂O | 2.5 | — |
| Yttrialite-(Y) | Y₂Si₂O₇ | — | 4.26 g/cm³ |
| Yttrotungstite-(Ce) | CeW₂O₇(OH)(H₂O) | — | — |
| Yttrotungstite-(Nd) | NdW₂O₇(OH)(H₂O) | — | — |
| Yttrotungstite-(Y) | YW₂O₇(OH)(H₂O) | — | — |
| Yugawaralite | Ca(Si₆Al₂)O₁₆·4H₂O | — | — |
| Yuksporite | K₄(Ca,Na)₁₄(Sr,Ba)₂(☐,Mn,Fe)(Ti,Nb)₄(O,OH)₄(Si₆O₁₇)₂(Si₂O₇)₃(H₂O,OH)₃ | 5.0 | — |
| Yulinite | SrNb₂O₆ | — | 5.04 g/cm³ |
| Yunhaoite | K₂(MoO₄) | — | 3.14 g/cm³ |
| Yusupovite | Na₂Zr(Si₆O₁₅)(H₂O)₃ | — | — |
| Yuzuxiangite | Sr₃Fe³⁺(Si₂O₆)₂(OH)·3H₂O | — | — |
| Zabuyelite | Li₂[CO₃] | 3.0 | — |
| Zanazziite | Ca₂Be₄Mg₅(PO₄)₆(OH)₄·6H₂O | 5.0 | — |
| Zavalíaite | Mn²⁺₃(PO₄)₂ | — | — |
| Zavyalovite | Ag₂TeS₃ | — | 5.15 g/cm³ |
| Zaykovite | — | — | — |
| Zdenĕkite | NaPbCu₅(AsO₄)₄Cl·5H₂O | — | — |
| Zeravshanite | Na₂Cs₄Zr₃[Si₁₈O₄₅]*₂H₂O | — | — |
| Zhanghuifenite | Na₃Mn₄Mg₂Al(PO₄)₆ | — | — |
| Zharchikhite | Al(OH)₂F | — | — |
| Ziesite | β-Cu₂(V₂O₇) | — | — |
| Zilbermintsite-(La) | (CaLa₅)(Fe³⁺Al₃Fe²⁺)[Si₂O₇][SiO₄]₅O(OH)₃ | — | — |
| Zincmelanterite | ZnSO₄·7H₂O | — | — |
| Zincoberaunite | ZnFe³⁺₅(PO₄)₄(OH)₅(H₂O)₄·2H₂O | — | — |
| Zincobotryogen | (Zn,Mg,Mn²⁺)Fe³⁺(SO₄)₂(OH) * 7H₂O | — | — |
| Zincobradaczekite | NaZn₂Cu₂(AsO₄)₃ | — | — |