MINERALS IN O

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Offretite

Class : Silicates
Subclass : Tectosilicates
Crystal system : Hexagonal
Chemistry : (K,Ca,Mg)3Al5Si13O36 15H2O
Rarity : Rare

Size : µm / mm / cm / dm / m

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Okenite

Class : Silicates
Subclass : Inosilicates
Crystal system : Triclinic
Chemistry : Ca5Si9O23 9H2O
Rarity : Uncommon

Size : µm / mm / cm / dm / m

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Oligoclase

Class : Silicates
Subclass : Tectosilicates
Crystal system : Triclinic
Chemistry : (Na,Ca)(Al,Si)4O8
Rarity : Ubiquitous

Size : µm / mm / cm / dm / m

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Olivenite

Class : Phosphates, arsenates, vanadates
Subclass : Anhydrous arsenates
Crystal system : Monoclinic
Chemistry : Cu2(AsO4)(OH)
Rarity : Uncommon

Size : µm / mm / cm / dm / m

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Olivine

Class : Silicates
Subclass : Nesosilicates
Crystal system : Orthorhombic
Chemistry : X2SiO4
Rarity : Very common

Size : µm / mm / cm / dm / m

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Omphacite

Class : Silicates
Subclass : Inosilicates
Crystal system : Monoclinic
Chemistry : (Ca,Na)(Mg,Fe,Al)Si2O6
Rarity : Uncommon

Size : µm / mm / cm / dm / m

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Onoratoite

Class : Halides
Subclass : Oxychlorides
Crystal system : Monoclinic
Chemistry : Sb8O11Cl2
Rarity : Very rare

Size : µm / mm / cm / dm / m

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Opal

Class : Silicates
Subclass : Tectosilicates
Crystal system : Amorphous
Chemistry : SiO2 nH2O
Rarity : Common

Size : µm / mm / cm / dm / m

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Gold

Class : Elements
Subclass : Metals
Crystal system : Cubic
Chemistry : Au
Rarity : Uncommon

Size : µm / mm / cm / dm / m

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Orpiment

Class : Sulfides and sulphosalts
Subclass : Sulfides
Crystal system : Monoclinic
Chemistry : As2S3
Rarity : Faily common

Size : µm / mm / cm / dm / m

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Orthoclase

Class : Silicates
Subclass : Tectosilicates
Crystal system : Monoclinic
Chemistry : KAlSi3O8
Rarity : Ubiquitous

Size : µm / mm / cm / dm / m

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Osumilite

Class : Silicates
Subclass : Cyclosilicates
Crystal system : Hexagonal
Chemistry : K(Fe,Mg)2(Al,Fe)3(Si,Al)12O30
Rarity : Rare

Size : µm / mm / cm / dm / m

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Otavite

Class : Carbonates, nitrates, borates
Subclass : Anhydrous carbonates
Crystal system : Trigonal
Chemistry : CdCO3
Rarity : Rare to very rare

Size : µm / mm / cm / dm / m

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Ottrelite

Class : Silicates
Subclass : Nesosilicates
Crystal system : Monoclinic
Chemistry : (Mn,Fe,Mg)2Al4Si2O10(OH)4
Rarity : Very rare

Size : µm / mm / cm / dm / m

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