Model
Class : Phosphates, arsenates, vanadatesSubclass : Hydrated ArsenatesCrystal system : TriclinicChemistry : Na2Fe5TiSi6O20Rarity : Rare
Size : µm / mm / cm / dm / m
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Allophane
Class : SilicatesSubclass : PhyllosilicatesCrystal system : AmorphousChemistry : Al2SiO5 3H2ORarity : Fairly common
Amber
Class : Organic compoundsSubclass : -Crystal system : AmorphousChemistry : C,H,ORarity : Rare to common
Lussatite
Class : SilicatesSubclass : TectosilicatesCrystal system : Disordered fibersChemistry : SiO2 n(H2O)Rarity : Very rare
Opal
Class : SilicatesSubclass : TectosilicatesCrystal system : AmorphousChemistry : SiO2 nH2ORarity : Common