| Yafsoanite | Ca₃Te⁶⁺₂(ZnO₄)₃ | Cubic | 5.5 | — |
| Yagiite | NaMg₂(AlMg₂Si₁₂)O₃₀ | Hexagonal | — | — |
| Yakhontovite | (Ca,Na,K)₀.₂(Cu,Fe,Mg)₂(Si₄O₁₀)(OH)₂·3H₂O | Monoclinic | — | — |
| Yakovenchukite-(Y) | K₃NaCaY₂Si₁₂O₃₀·4H₂O | Orthorhombic | — | — |
| Yakubovichite | CaNi₂Fe³⁺(PO₄)₃ | Orthorhombic | — | — |
| Yamhamelachite | KCrP₂O₇ | Monoclinic | — | 2.94 g/cm³ |
| Yancowinnaite | PbCuAl(AsO₄)₂OH·H₂O | Triclinic | 3.0 | — |
| Yangite | PbMnSi₃O₈·H₂O | Triclinic | — | — |
| Yangzhumingite | KMg₂.₅Si₄O₁₀F₂ | Monoclinic | — | — |
| Yanomamite | In(AsO₄)·2H₂O | Orthorhombic | — | — |
| Yarlongite | (Cr₄Fe₄Ni)C₄ | Hexagonal | — | — |
| Yaroshevskite | Cu₉O₂(VO₄)₄Cl₂ | Triclinic | — | — |
| Yaroslavite | Ca₃Al₂F₁₀(OH)₂·H₂O | Orthorhombic | — | — |
| Yarrowite | Cu₉S₈ | Trigonal | — | 4.89 g/cm³ |
| Yarzhemskiite | K[B₅O₇(OH)₂]·H₂O | Monoclinic | — | — |
| Yavapaiite | KFe³⁺(SO₄)₂ | Monoclinic | — | — |
| Yazganite | ☐NaMgFe³⁺₂(AsO₄)₃·H₂O | Monoclinic | 5.0 | — |
| Ye'elimite | Ca₄Al₆O₁₂(SO₄) | Cubic | — | 2.52 g/cm³ |
| Yeatmanite | Zn₆Mn²⁺₉Sb⁵⁺₂O₁₂(SiO₄)₄ | Triclinic | — | — |
| Yecoraite | Fe³⁺₃Bi₅O₉(Te⁴⁺O₃)(Te⁶⁺O₄)₂·9H₂O | Tetragonal | — | — |
| Yedlinite | Pb₆Cr(Cl,OH)₆(O,OH)₈ | Trigonal | — | — |
| Yegorovite | Na₄[Si₂O₄(OH)₂]₂·7H₂O | Monoclinic | — | — |
| Yeite | TiSi | Orthorhombic | — | 4.27 g/cm³ |
| Yellowcatite | KNaFe³⁺₂(Se⁴⁺O₃)₂(V⁵⁺₂O₇)·7H₂O | Hexagonal | — | — |
| Yeomanite | Pb₂O(OH)Cl | Orthorhombic | — | — |
| Yftisite-(Y) | — | Orthorhombic | — | — |
| Yimengite | K(Cr,Ti,Fe,Mg)₁₂O₁₉ | Hexagonal | — | — |
| Yingjiangite | K₂Ca(UO₂)₇(PO₄)₄(OH)₆·6H₂O | Orthorhombic | — | — |
| Yixunite | Pt₃In | Cubic | — | 17.91 g/cm³ |
| Yoderite | (MgAl₃)(MgAl)Al₂O₂(SiO₄)₄(OH)₂ | Monoclinic | 6.0 | — |
| Yofortierite | Mn²⁺₅Si₈O₂₀(OH)₂·7H₂O | Monoclinic | 2.5 | — |
| Yoshimuraite | Ba₄(Mn²⁺)₄Ti₂(Si₂O₇)₂(PO₄)₂O₂(OH)₂ | Triclinic | — | — |
| Yoshiokaite | Ca₁₋ₓ(Al,Si)₂O₄ | Trigonal | — | — |
| Yttriaite-(Y) | Y₂O₃ | Cubic | — | — |
| Yttrialite-(Y) | Y₂Si₂O₇ | Monoclinic | — | 4.26 g/cm³ |
| Yttrocolumbite-(Y) | (Y,U,Fe²⁺)(Nb,Ta)O₄ | Orthorhombic | — | — |
| Yttrocrasite-(Y) | (Y,Th,Ca,U)(Ti,Fe)₂(O,OH)₆ | — | — | — |
| Yttrotantalite-(Y) | (Y,U,Fe²⁺)(Ta,Nb)(O,OH)₄ | Orthorhombic | — | — |
| Yttrotungstite-(Ce) | CeW₂O₇(OH)(H₂O) | Monoclinic | — | — |
| Yttrotungstite-(Nd) | NdW₂O₇(OH)(H₂O) | Monoclinic | — | — |
| Yttrotungstite-(Y) | YW₂O₇(OH)(H₂O) | Monoclinic | — | — |
| Yuanfuliite | Mg(Fe³⁺,Al)O(BO₃) | Orthorhombic | — | — |
| Yuanjiangite | AuSn | Hexagonal | — | 11.38 g/cm³ |
| Yuchuanite-(Y) | Y₂(CO₃)₃·H₂O | Triclinic | — | — |
| Yugawaralite | Ca(Si₆Al₂)O₁₆·4H₂O | Monoclinic | — | — |
| Yukonite | Ca₂Fe³⁺₃(AsO₄)₃(OH)₄·4H₂O | Orthorhombic | — | — |
| Yuksporite | K₄(Ca,Na)₁₄(Sr,Ba)₂(☐,Mn,Fe)(Ti,Nb)₄(O,OH)₄(Si₆O₁₇)₂(Si₂O₇)₃(H₂O,OH)₃ | Monoclinic | 5.0 | — |
| Yulinite | SrNb₂O₆ | Monoclinic | — | 5.04 g/cm³ |
| Yunhaoite | K₂(MoO₄) | Monoclinic | — | 3.14 g/cm³ |
| Yurgensonite | K₂SnTiO₂(AsO₄)₂ | Orthorhombic | — | — |
| Yurmarinite | Na₇(Fe³⁺,Mg,Cu)₄(AsO₄)₆ | Trigonal | — | — |
| Yushkinite | (Mg,Al)(OH)₂VS₂ | Hexagonal | — | — |
| Yusupovite | Na₂Zr(Si₆O₁₅)(H₂O)₃ | Monoclinic | — | — |
| Yuzuxiangite | Sr₃Fe³⁺(Si₂O₆)₂(OH)·3H₂O | Monoclinic | — | — |
| Yvonite | Cu(AsO₃OH)·2H₂O | Triclinic | — | — |