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- Questionable
Questionable minerals
93 minerals
| Mineral | Chemical formula | Crystal system | Mohs hardness | Density |
|---|---|---|---|---|
| Arzrunite | Pb₂Cu₄SO₄(OH)₄Cl₆·2H₂O | — | — | — |
| Baumhauerite II | Pb₃As₄S₉ | Monoclinic | — | — |
| Belyankinite | Ca₁-₂(Ti,Nb)₅O₁₂ * 9H₂O (?) | Amorphous | — | — |
| Bindheimite | — | Cubic | — | — |
| Birunite | Ca₁₈(SiO₃)₈.₅(CO₃)₈.₅(SO₄)·15H₂O | — | — | — |
| Bismutostibiconite | (Bi,Fe³⁺,☐)₂Sb⁵⁺₂O₇ | Cubic | — | — |
| Blakeite | Fe³⁺₂[Te⁴⁺O₃]₃ (?) | — | — | — |
| Bolivarite | Al₂PO₄(OH)₃·4H₂O | Amorphous | — | — |
| Brugnatellite | Mg₆Fe³⁺(CO₃)(OH)₁₃·4H₂O | Hexagonal | — | — |
| Calciosamarskite | (Ca,Fe,Y)(Nb,Ta,Ti)O₄ | — | — | — |
| Calcybeborosilite-(Y) | (Y,REE,Ca)(B,Be)₂(SiO₄)₂(OH,O)₂ | — | — | — |
| Carrboydite | (Ni₁-xAlx)(SO₄)x/₂(OH)₂ * nH₂O | Hexagonal | — | — |
| Cebollite | Ca₅Al₂(SiO₄)₃(OH)₄ | — | 5.0 | — |
| Chloromagnesite | MgCl₂ | Hexagonal | — | 2.28 g/cm³ |
| Cirrolite | Ca₃Al₂(PO₄)₃(OH)₃ | — | — | — |
| Cousinite | MgU₂Mo₂O₁₁ * 6H₂O | — | — | — |
| Cuproauride | Cu₃Au | Cubic | — | 12.35 g/cm³ |
| Delvauxite | CaFe³⁺₄(PO₄)₂(OH)₈·4-5H₂O (?) | Amorphous | — | — |
| Fergusonite-(Ce) | (Ce,La,Nd)NbO₄ | Tetragonal | — | — |
| Ferrisymplesite | Fe³⁺₃(AsO₄)₂(OH)₃·5H₂O | — | 2.5 | — |
| Giorgiosite | Mg₅(CO₃)₄(OH)₂·5H₂O | — | — | — |
| Hectorite | H₂LiMgNaO₁₂Si₄²⁻ | Monoclinic | — | — |
| Hydroscarbroite | Al₁₄(CO₃)₃(OH)₃₆ * nH₂O | — | — | — |
| Ilsemannite | Mo₃O₈·nH₂O (?) | — | — | — |
| Ishikawaite | (U,Fe,Y)NbO₄ | Monoclinic | — | — |
| Isoclasite | Ca₂(PO₄)(OH)·2H₂O | Monoclinic | — | — |
| Jaipurite | CoS | Hexagonal | — | — |
| Joséite-A | Bi₄TeS₂ | — | — | — |
| Joséite-B | Bi₄Te₂S | Trigonal | — | — |
| Juanite | Ca₁₀Mg₄Al₂Si₁₁O₃₉·4H₂O or near | — | — | — |
| Jusite | Na₂Ca₁₅Al₄Si₁₆O₅₄·17H₂O | — | — | — |
| Kalinite | KAl(SO₄)₂·11H₂O | Monoclinic | — | — |
| Karnasurtite-(Ce) | (Ce,La,Th)(Ti,Nb)(Al,Fe)(Si₂O₇)(OH)₄ * 3H₂O | Amorphous | — | — |
| Karpinskite | (Mg,Ni)₂Si₂O₅(OH)₂ (?) | — | — | — |
| Kolovratite | NixZny(VO₄)₀.₆₇(x+y) * nH₂O | — | — | — |
| Kurumsakite | Zn₈Al₈V⁵⁺₂Si₅O₃₅·27H₂O (?) | — | — | — |
| Lechatelierite | SiO₂ | Amorphous | 5.5 | 2.12 g/cm³ |
| Maghagendorfite | (Na,☐)MgMn(Fe,Fe)₂(PO₄)₃ | — | — | — |
| Manganbelyankinite | (Mn,Ca)(Ti,Nb)₅O₁₂ * 9H₂O | Amorphous | — | — |
| Melanocerite-(Ce) | Ce₅(SiO₄,BO₄)₃(OH,O) | — | — | — |
| Meta-alunogen | Al₂(SO₄)₃·14H₂O | Orthorhombic | — | — |
| Metauramphite | (NH₄)₂(UO₂)₂(PO₄)₂·6H₂O | — | — | — |
| Monimolite | Pb₂Sb⁵⁺2O₇ | — | — | — |
| Motukoreaite | Mg₆Al₃(OH)₁₈[Na(H₂O)₆][SO₄]₂·6H₂O | Trigonal | — | — |
| Muskoxite | Mg₇Fe³⁺₄(OH)₂₆·H₂O | Trigonal | — | — |
| Nasledovite | PbMn₃Al₄(CO₃)₄(SO₄)O₅ * 5H₂O | — | — | — |
| Native cerium | Ce | — | — | — |
| Natroglaucocerinite | Zn₆Al₃(OH)₁₈[Na(H₂O)₆](SO₄)₂·6H₂O | — | — | — |
| Natroniobite | NaNbO₃ | — | — | 4.47 g/cm³ |
| Palladinite | PdO | Tetragonal | — | 8.12 g/cm³ |
| Paraschoepite | UO₃ * 2H₂O | — | — | — |
| Phylloretine | C₁₈H₁₈ | Orthorhombic | — | — |
| Pigotite | Al₄C₆H₅O₁₀·13H₂O (?) | — | — | — |
| Pintadoite | Ca₂(V₂O₇)·9H₂O | — | — | — |
| Pitticite | [Fe,AsO₄,SO₄,H₂O] (?) | Amorphous | — | — |
| Plumosite | Pb₂Sb₂S₅ | Orthorhombic | — | — |
| Przhevalskite | Pb₂(UO₂)₃(PO₄)₂(OH)₄ * 3H₂O | Tetragonal | — | — |
| Pseudocotunnite | K₂PbCl₄ (?) | — | — | — |
| Písekite-(Y) | (Y,As,Ca,Fe,U)(Nb,Ti,Ta)O₄ | — | — | — |
| Qitianlingite | Fe²⁺₂Nb₂W⁶⁺O₁₀ | Orthorhombic | — | — |
| Rathite-IV | Pb₃As₅S₁₀ | Monoclinic | — | — |
| Rauvite | Ca(UO₂)₂(V₁₀O₂₈) * 16H₂O | — | — | — |
| Redingtonite | (Fe²⁺,Mg,Ni)(Cr,Al)₂(SO₄)₄*₂₂H₂O | Monoclinic | — | — |
| Redondite | Al(PO₄)·2H₂O | — | — | — |
| Renardite | Pb(UO₂)₄(PO₄)₂(OH)₄·7H₂O | — | — | — |
| Richellite | CaFe³⁺₂(PO₄)₂(OH,F)₂ | Tetragonal | — | — |
| Rilandite | Cr₆SiO₁₁·5H₂O (?) | — | — | — |
| Riversideite | Ca₅Si₆O₁₆(OH)₂·2H₂O | — | — | — |
| Rosièresite | [Pb,Cu,Al,PO₄,H₂O] (?) | Amorphous | — | — |
| Samarskite-(Yb) | YbNbO₄ | Monoclinic | — | 7.68 g/cm³ |
| Satpaevite | Al₁₂(V⁴⁺,V⁵⁺)₈O₃₇·30H₂O (?) | — | 1.5 | — |
| Smirnovskite | (Th,Ca)(PO₄)·nH₂O | — | — | — |
| Spadaite | MgSiO₂(OH)₂·H₂O (?) | — | — | — |
| Stevensite | (Ca,Na)xMg₃-x(Si₄O₁₀)(OH)₂ | — | — | — |
| Stibiconite | Sb³⁺Sb⁵⁺₂O₆(OH) | Cubic | — | — |
| Tertschite | Ca₄B₁₀O₁₉·20H₂O | — | — | — |
| Tocornalite | (Ag,Hg)I (?) | — | — | — |
| Uduminelite | Ca₃Al₈(PO₄)₂O₁₂·2H₂O | — | — | — |
| Ustarasite | Pb(Bi,Sb)₆S₁₀ (?) | — | — | — |
| Uvanite | (UO₂)₂V⁵⁺₆O₁₇·15H₂O (?) | Orthorhombic | — | — |