Chrysocolla
Chemical Formula	(Cu,Al)2H2Si2O5(OH)4·nH2O
Species	Silicates
Crystal System	Orthorhombic
Mohs Scale	2-3
Specific Gravity	1.9-2.4
Color	Blue, blue-green, green
Streak	white to a blue-green color
Luster	Vitreous, Waxy, Earthy
Refractive Index	n = 1.575 - 1.585 n = 1.597 n = 1.598 - 1.635
Diaphaneity	Translucent, Opaque
Cleavage	None ObservedNone
Fracture	Irregular/Uneven, Sub-Conchoidal
Crystal Habit：Massive, nodular, botryoidal
Geological Setting：Found in the oxidation zone of copper deposits, often encrusting or replacing earler secondary minerals.