| Wadalite | (Ca,Mg)₆(Al,Fe³⁺)₄((Si,Al)O₄)₃O₄Cl₃ | Cubic | 6.5 | — |
| Wadeite | K₂Zr(Si₃O₉) | Hexagonal | — | 2.98 g/cm³ |
| Wadsleyite | Mg₂SiO₄ | Orthorhombic | — | 3.24 g/cm³ |
| Wagnerite | Mg₂PO₄F | Monoclinic | — | 3.02 g/cm³ |
| Waimirite-(Y) | YF₃ | Orthorhombic | — | 5.08 g/cm³ |
| Waipouaite | — | Monoclinic | — | — |
| Wairakite | Ca(Si₄Al₂)O₁₂·2H₂O | Monoclinic | — | — |
| Wairauite | CoFe | Cubic | 5.0 | 8.33 g/cm³ |
| Wakabayashilite | [(As,Sb)₆S₉][As₄S₅] | Orthorhombic | 1.5 | — |
| Wakefieldite-(Ce) | Ce(VO₄) | Tetragonal | — | — |
| Wakefieldite-(La) | La(VO₄) | Tetragonal | 4.0 | 4.62 g/cm³ |
| Wakefieldite-(Nd) | NdVO₄ | Tetragonal | — | 4.93 g/cm³ |
| Wakefieldite-(Y) | Y(VO₄) | Tetragonal | — | 4.22 g/cm³ |
| Walentaite | Fe³⁺₃(P₀.₈₄As₀.₁₆O₄)₂(O,OH)₆As³⁺₂.₅₆Ca₀.₄₂Na₀.₂₈Mn²⁺₀.₃₅Fe²⁺₀.₃₀O₆.₁(OH)₀.₉(H₂O)₀.₉ | Orthorhombic | — | — |
| Walfordite | (Fe³⁺,Te₆+)Te₄+₃O₈ | Cubic | — | — |
| Walkerite | Ca₁₆(Mg,Li,☐)₂[B₁₃O₁₇(OH)₁₂]₄Cl₆*₂₈H₂O | Orthorhombic | — | — |
| Wallisite | CuPbTlAs₂S₅ | Triclinic | — | — |
| Wallkilldellite | Ca₂Mn²⁺₃(AsO₄)₂(OH)₄ * 9H₂O | Hexagonal | — | — |
| Wallkilldellite-(Fe) | (Ca,Cu)₄Fe²⁺₆(AsO₄,SiO₄)₄(OH,O)₈ * 18H₂O | Hexagonal | — | — |
| Walpurgite | (BiO)₄(UO₂)(AsO₄)₂·2H₂O | Triclinic | 3.5 | — |
| Walstromite | BaCa₂(Si₃O₉) | Triclinic | — | — |
| Walthierite | Ba₀.₅Al₃(SO₄)₂(OH)₆ | Trigonal | — | — |
| Wampenite | C₁₈H₁₆ | Monoclinic | — | — |
| Wangdaodeite | FeTiO₃ | Trigonal | — | — |
| Wangkuirenite | Pb₃Cl₂(SeO₃)₂ | Monoclinic | — | — |
| Wangpuite | K₃(PO₄)(Mo₁₂O₃₆) | Cubic | — | 4.14 g/cm³ |
| Wangxibinite | TiFe | Cubic | — | 6.79 g/cm³ |
| Wangyanite | PdNi₈S₈ | Cubic | — | — |
| Wardite | NaAl₃(PO₄)₂(OH)₄·2H₂O | Tetragonal | 5.0 | — |
| Wardsmithite | Ca₅Mg[B₄O₇]₆ * 3₀H₂O | Hexagonal | — | — |
| Warikahnite | Zn₃(AsO₄)₂·2H₂O | Triclinic | 2.0 | — |
| Warkite | Ca₂Sc₆Al₆O₂₀ | Triclinic | — | — |
| Warwickite | (Mg,Ti,Fe,Cr,Al)₂O(BO₃) | Orthorhombic | — | — |
| Wassonite | TiS | Trigonal | — | 4.46 g/cm³ |
| Watanabeite | Cu₄(As,Sb)₂S₅ | Orthorhombic | — | — |
| Watatsumiite | Na₂KLi(Mn²⁺,Fe²⁺)₂V₄+₂[Si₈O₂₄] | Monoclinic | — | — |
| Waterhouseite | Mn₇(PO₄)₂(OH)₈ | Monoclinic | — | — |
| Watkinsonite | Cu₂PbBi₄(Se,S,Te)₈ | Monoclinic | — | — |
| Wattersite | (Hg+₂)₂Hg²⁺(CrO₄)O₂ | Monoclinic | — | — |
| Wattevilleite | Na₂Ca(SO₄)₂·4H₂O (?) | Orthorhombic | — | — |
| Wavellite | Al₃(PO₄)₂(OH)₃·5H₂O | Orthorhombic | — | — |
| Wawayandaite | Ca₆Mn₂BBe₉Si₆O₂₃(OH,Cl)₁₅ | Monoclinic | — | — |
| Waylandite | BiAl₃(PO₄)₂(OH)₆ | Trigonal | — | — |
| Wayneburnhamite | Pb₉Ca₆(Si₂O₇)₃(SiO₄)₃ | Hexagonal | — | — |
| Weberite | Na₂MgAlF₇ | Orthorhombic | 3.5 | 2.84 g/cm³ |
| Weddellite | Ca(C₂O₄)·2H₂O | Tetragonal | 4.0 | — |
| Weeksite | K₂(UO₂)₂(Si₅O₁₃) * 4H₂O | Monoclinic | — | 4.10 g/cm³ |
| Wegscheiderite | Na₅H₃(CO₃)₄ | Triclinic | — | 2.40 g/cm³ |
| Weibullite | Ag₀.₃Pb₅.₃Bi₈.₃(S,Se)₁₈ | Orthorhombic | — | — |
| Weilerite | BaAl₃(SO₄)(AsO₄)(OH)₆ | — | — | — |
| Weilite | Ca(AsO₃OH) | Triclinic | — | — |
| Weinebeneite | CaBe₃(PO₄)₂(OH)₂ * 4H₂O | Monoclinic | — | — |
| Weishanite | (Au,Ag,Hg) | Hexagonal | 2.5 | — |
| Weissbergite | TlSbS₂ | Triclinic | 1.5 | 5.81 g/cm³ |
| Weissite | Cu₂₋ₓTe | Hexagonal | — | — |
| Welinite | Mn²⁺₆(W₆+,Mg)₂(SiO₄)₂(O,OH)₆ | Trigonal | — | — |
| Weloganite | Na₂Sr₃Zr(CO₃)₆·3H₂O | Triclinic | 3.5 | — |
| Welshite | Ca₄Mg₉Sb₃O₄[Si₆Be₃AlFe₂O₃₆] | Triclinic | 6.0 | — |
| Wendwilsonite | Ca₂Mg(AsO₄)₂·2H₂O | Monoclinic | — | — |
| Wenjiite | Ti10SixPy | Hexagonal | — | — |
| Wenkite | Ba₄Ca₆(Si,Al)₂₀O₄₁(OH)₂(SO₄)₃(H₂O) | Hexagonal | — | — |
| Wenqingite | Pb₅(AsS₃)₂(Ge₂S₆) | Monoclinic | — | — |
| Werdingite | (Mg,Fe)₂Al₁₄Si₄B₄O₃₇ | Triclinic | — | — |
| Wermlandite | Mg₇Al₂(OH)₁₈[Ca(H₂O)₆][SO₄]₂ * ₆H₂O | Trigonal | — | — |
| Wernerbaurite | {(NH₄)₂[Ca₂(H₂O)₁₄]₂(H₂O)₂}{V₁₀O₂₈} | Triclinic | — | — |
| Wernerkrauseite | Ca(Fe³⁺,Mn³⁺)₂Mn⁴⁺O₆ | Orthorhombic | — | — |
| Wesselsite | SrCuSi₄O₁₀ | Tetragonal | — | — |
| Westerveldite | (Fe,Ni,Co)As | Orthorhombic | — | — |
| Wetherillite | Na₂Mg(UO₂)₂(SO₄)₄·18H₂O | Monoclinic | — | — |
| Wheatleyite | Na₂Cu(C₂O₄)₂·2H₂O | Triclinic | — | — |
| Whelanite | Cu₂Ca₆[Si₆O₁₇(OH)](CO₃)(OH)₃(H₂O)₂ | — | — | — |
| Wherryite | Pb₇Cu₂(SO₄)₄(SiO₄)₂(OH)₂ | Monoclinic | — | — |
| Whewellite | Ca(C₂O₄)·H₂O | Monoclinic | — | — |
| Whitecapsite | H₁₆Fe²⁺₅Fe³⁺₁₄Sb³⁺₆(AsO₄)₁₈O₁₆·120H₂O | Hexagonal | — | — |
| Whiteite-(CaFeMg) | CaFe²⁺Mg₂Al₂(PO₄)₄(OH)₂(H₂O)₈ | Monoclinic | — | — |
| Whiteite-(CaMgMg) | CaMg₃Al₂(PO₄)₄(OH)₂·2H₂O | Monoclinic | — | — |
| Whiteite-(CaMnFe) | CaMnFe₂Al₂(PO₄)₄(OH)₂·8H₂O | — | — | — |
| Whiteite-(CaMnMg) | CaMn²⁺Mg₂Al₂(PO₄)₄(OH)₂(H₂O)₈ | Monoclinic | — | — |
| Whiteite-(CaMnMn) | CaMn²⁺Mn²⁺₂Al₂(PO₄)₄(OH)₂·8H₂O | Monoclinic | — | — |
| Whiteite-(MnFeMg) | Mn²⁺Fe²⁺Mg₂Al₂(PO₄)₄(OH)₂(H₂O)₈ | Monoclinic | — | — |
| Whiteite-(MnMnMg) | MnMnMg₂Al₂(PO₄)₄(OH)₂ * 8H₂O | Monoclinic | — | — |
| Whiteite-(MnMnMn) | — | Monoclinic | — | — |
| Whiterockite | — | Monoclinic | — | — |
| Whitlockite | Ca₉Mg(PO₄)₆(PO₃OH) | Trigonal | 5.0 | — |
| Whitmoreite | Fe²⁺Fe³⁺₂(PO₄)₂(OH)₂ * 4H₂O | Monoclinic | 3.0 | — |
| Wickenburgite | CaPb₃Al₂Si₁₀O₂₄(OH)₆ | Trigonal | — | — |
| Wickmanite | Mn²⁺Sn⁴⁺(OH)₆ | Cubic | 3.5 | — |
| Wicksite | NaCa₂(Fe²⁺,Mn²⁺)₄MgFe³⁺(PO₄)₆ * 2H₂O | Orthorhombic | — | — |
| Widenmannite | Pb₂(OH)₂[(UO₂)(CO₃)₂] | Orthorhombic | — | — |
| Widgiemoolthalite | Ni₅(CO₃)₄(OH)₂·4-5H₂O | Monoclinic | — | — |
| Wightmanite | Mg₅(BO₃)O(OH)₅ * 2H₂O | Monoclinic | — | — |
| Wiklundite | Pb₂[₄](Mn²⁺,Zn)₃(Fe³⁺,Mn²⁺)₂(Mn²⁺,Mg)₁₉(As³⁺O₃)₂[(Si,As₅+)O₄]₆(OH)₁₈Cl₆ | Trigonal | — | — |
| Wilancookite | (Ba₅Li₂☐)Ba₆Be₂₄P₂₄O₉₆·26H₂O | Cubic | — | — |
| Wilcoxite | MgAl(SO₄)₂F * 17H₂O | Triclinic | — | — |
| Wildcatite | — | Trigonal | — | — |
| Wildenauerite | Zn(Fe³⁺,Mn²⁺)₂MnFe³⁺(PO₄)₃(OH)₃(H₂O)₆*₂H₂O | Orthorhombic | — | — |
| Wilhelmgümbelite | — | Orthorhombic | — | — |
| Wilhelmkleinite | ZnFe³⁺₂(AsO₄)₂(OH)₂ | Monoclinic | 4.5 | 4.36 g/cm³ |
| Wilhelmramsayite | Cu₃FeS₃*₂H₂O | Orthorhombic | — | — |
| Wilhelmvierlingite | CaMnFe³⁺(PO₄)₂(OH) * 2H₂O | Orthorhombic | — | — |
| Wilkinsonite | Na₂Fe²⁺₄Fe³⁺₂(Si₆O₁₈)O₂ | Triclinic | — | — |
| Wilkmanite | Ni₃Se₄ | Monoclinic | — | — |
| Willemite | Zn₂SiO₄ | Trigonal | 5.5 | 4.25 g/cm³ |
| Willemseite | Ni₃Si₄O₁₀(OH)₂ | Monoclinic | 2.0 | 3.31 g/cm³ |
| Willhendersonite | KCa[Al₃Si₃O₁₂] * 5H₂O | Triclinic | — | — |
| Willyamite | CoSbS | Orthorhombic | — | 7.02 g/cm³ |
| Wiluite | Ca₁₉(Al,Mg)₁₃(B,☐,Al)₅(Si₂O₇)₄(SiO₄)₁₀(O,OH)₁₀ | Tetragonal | 6.0 | 3.36 g/cm³ |
| Winchite | ☐(NaCa)(Mg₄Al)Si₈O₂₂(OH)₂ | Monoclinic | — | — |
| Windhoekite | Ca₂Fe³⁺₃₋ₓ[Si₈O₂₀](OH)₄·10H₂O | Monoclinic | — | — |
| Windmountainite | ☐Fe³⁺₂Mg₂☐₂Si₈O₂0(OH)₂∙8H₂O | Monoclinic | — | — |
| Winstanleyite | TiTe₄+₃O₈ | Cubic | — | — |
| Wiperamingaite | NaCaFe³⁺Al(PO₄)F₅(OH)·H₂O | Orthorhombic | — | — |
| Wiserite | Mn²⁺₁₄(B₂O₅)₄(OH)₈·(Si,Mg)(O,OH)₄Cl | Tetragonal | 2.5 | — |
| Witherite | BaCO₃ | Orthorhombic | — | 4.24 g/cm³ |
| Wittichenite | Cu₃BiS₃ | Orthorhombic | — | — |
| Wittite | Pb₉Bi₁₂(S,Se)₂₇ | Monoclinic | — | — |
| Witzkeite | Na₄K₄Ca(NO₃)₂(SO₄)₄·2H₂O | Monoclinic | 2.0 | — |
| Wodginite | Mn²⁺Sn⁴⁺Ta₂O₈ | Monoclinic | — | — |
| Wolfeite | (Fe²⁺,Mn²⁺)₂(PO₄)(OH) | Monoclinic | — | — |
| Wolfsriedite | Pb[(UO₂)₂(W⁶⁺Fe³⁺)O₇(OH)](H₂O)₃ | Monoclinic | — | — |
| Wollastonite | CaSiO₃ | Triclinic | — | 2.90 g/cm³ |
| Wonesite | (Na,K)(Mg,Fe,Al)₆((Al,Si)₄O₁₀)₂(OH,F)₄ | Triclinic | — | — |
| Woodallite | Mg₆Cr₂(OH)₁₆Cl₂·4H₂O | Trigonal | — | — |
| Woodhouseite | CaAl₃(SO₄)(PO₄)(OH)₆ | Trigonal | 4.5 | — |
| Woodruffite | Zn²⁺x/₂(Mn₄+₁-xMn³⁺x)O₂*yH₂O | Monoclinic | — | — |
| Woodwardite | (Cu₁-ₓAlₓ)(SO₄)ₓ/₂(OH)₂ · nH₂O (x < 0.5, n < 3x/2) | Hexagonal | 2.0 | — |
| Wooldridgeite | Na₂CaCu²⁺₂(P₂O₇)₂ * 10H₂O | Orthorhombic | — | — |
| Wopmayite | Ca₆Na₃☐Mn(PO₄)₃(PO₃OH)₄ | Trigonal | — | — |
| Wortupaite | MgNi(Te⁴⁺O₃)₃·3H₂O | Hexagonal | — | — |
| Wrightite | K₂Al₂O(AsO₄)₂ | Orthorhombic | — | — |
| Wroewolfeite | Cu₄(SO₄)(OH)₆ * 2H₂O | Monoclinic | — | — |
| Wulfenite | PbMoO₄ | Tetragonal | 3.0 | 6.75 g/cm³ |
| Wulffite | K₃NaCu₄O₂(SO₄)₄ | Orthorhombic | — | — |
| Wumuite | KAl₀.₃₃W₂.₆₇O₉ | Hexagonal | — | — |
| Wupatkiite | (Co,Mg,Ni)Al₂(SO₄)₄*₂₂H₂O | Monoclinic | — | — |
| Wurtzite | ZnS | Hexagonal | — | 4.14 g/cm³ |
| Wusiheite | BaGe(Ge₃O₉) | Trigonal | — | — |
| Wuyanzhiite | Cu₂S | Tetragonal | — | — |
| Wyartite | CaU₅+(UO₂)₂(CO₃)O₄(OH) * 7H₂O | Orthorhombic | — | — |
| Wycheproofite | NaAlZr(PO₄)₂(OH)₂·H₂O | Triclinic | — | — |
| Wyllieite | (Na,Ca,Mn)(Mn,Fe)(Fe,Mg)Al(PO₄)₃ | Monoclinic | — | — |
| Wöhlerite | — | Monoclinic | — | — |
| Wölsendorfite | Pb₇(UO₂)₁₄O₁₉(OH)₄·12H₂O | Orthorhombic | 5.0 | — |
| Wülfingite | — | Orthorhombic | — | — |
| Wüstite | FeO | Cubic | 5.0 | — |