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Amorphous crystal system
20 minerals
| Mineral | Chemical formula | Mohs hardness | Density |
|---|---|---|---|
| Angastonite | CaMgAl₂(PO₄)₂(OH)₄·7H₂O | — | — |
| Belyankinite | Ca₁-₂(Ti,Nb)₅O₁₂ * 9H₂O (?) | — | — |
| Bolivarite | Al₂PO₄(OH)₃·4H₂O | — | — |
| Delvauxite | CaFe³⁺₄(PO₄)₂(OH)₈·4-5H₂O (?) | — | — |
| Diadochite | Fe³⁺₂(PO₄)(SO₄)(OH)·6H₂O | — | — |
| Evansite | Al₃PO₄(OH)₆·6H₂O | — | 2.00 g/cm³ |
| Georgeite | Cu₂(CO₃)(OH)₂ | — | — |
| Gerasimovskite | Mn²⁺(Nb,Ti)₅O₁₂·9H₂O | — | — |
| Jordisite | MoS₂ | — | 4.67 g/cm³ |
| Karnasurtite-(Ce) | (Ce,La,Th)(Ti,Nb)(Al,Fe)(Si₂O₇)(OH)₄ * 3H₂O | — | — |
| Lechatelierite | SiO₂ | 5.5 | 2.12 g/cm³ |
| Manganbelyankinite | (Mn,Ca)(Ti,Nb)₅O₁₂ * 9H₂O | — | — |
| Metastibnite | Sb₂S₃ | — | — |
| Meymacite | WO₃ * 2H₂O | — | — |
| Neotocite | — | — | — |
| Pitticite | [Fe,AsO₄,SO₄,H₂O] (?) | — | — |
| Rosièresite | [Pb,Cu,Al,PO₄,H₂O] (?) | — | — |
| Santabarbaraite | Fe³⁺₃(PO₄)₂(OH)₃ * 5H₂O | — | — |
| Thorosteenstrupine | (Ca,Th,Mn)₃Si₄O₁₁F·6H₂O | — | — |
| Umbozerite | Na₃Sr₄ThSi₈(O,OH)₂₄ | — | — |