Charoite

Charoite is a rare mineral, found in commercial quantities only in a few small and closely spaced deposits in the Sakha Republic of eastern Russia. It received its name from the Chara River, which drains that geographic area.
Chemical composition: (K,Na)5(Ca,Ba,Sr)8Si8O46(OH,F) · nH2O
Hardness: 6 – 6,5
Density: 2,5-2,6 g/cm³
Family:
Origin: Russia

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