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Questionable minerals
93 minerals
| Mineral | Chemical formula | Crystal system | Mohs hardness | Density |
|---|---|---|---|---|
| Varlamoffite | (Sn,Fe)(O,OH)₂ | Tetragonal | — | — |
| Vernadite | (Mn₄+,Fe³⁺,Ca,Na)(O,OH)₂ * nH₂O | Hexagonal | — | — |
| Wattevilleite | Na₂Ca(SO₄)₂·4H₂O (?) | Orthorhombic | — | — |
| Wittite | Pb₉Bi₁₂(S,Se)₂₇ | Monoclinic | — | — |
| Xingzhongite | Pb²⁺Ir³⁺₂S₄ | Cubic | — | — |
| 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 | — | — |
| Zaratite | Ni₃(CO₃)(OH)₄ * 4H₂O ? | Cubic | — | — |
| Zincaluminite | (Zn,Al)₉(SO₄)₂(OH)₁₈·nH₂O | — | — | — |
| Zincrosasite | (Zn,Cu)₂(CO₃)(OH)₂ | Monoclinic | — | — |
| Zincsilite | Zn₃(Si₄O₁₀)(OH)₂·4H₂O (?) | Monoclinic | — | — |
| Zirklerite | (Fe,Mg)₉Al₄Cl₁₈(OH)₁₂·14H₂O (?) | Hexagonal | — | — |