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Chemical Composition:
K(MgFe)3(AlFe)Si3O10(OHF)2
Group: Mica
System: Monoclinic
Family: Silicates
Hardness: 2.5 - 3
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- Rarely in tabular pseudo-hex crystals
- Other colours: brown or dark green
- Heavy
- Transparent or tranlucent
- Fuses with difficulty
- Soluble only in heated, concentrated sulfuric acid
- Found in: Brazil, Greenland, Italy, Scandinavia, USA,
former USSR
- Very common
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