Chrysocolla
Gemstone
>
Chrysocolla is a hydrous copper phyllosilicate mineral and mineraloid with the formula Cu
2 – ₓAl
ₓ
₄⋅nH
₂O or
₂H
₂Si
₂O
₅
₄⋅nH
₂O). Wikipedia
Chemical formula: Cu₂H₂Si₂O₅(OH)₄
Hardness (Mohs hardness scale): 2 – 4
Birefringence: δ = 0.023–0.050
Crystal habit: Massive, nodular, botryoidal
Crystal system: Orthorhombic; Unknown space group
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