Dioptase
Chemical Formula	CuSiO3·H2O
Species	Silicates
Crystal System	Trigonal
Mohs Scale	5
Specific Gravity	3.28-3.35
Color	Dark blue green, emerald green
Streak	Green
Luster	Vitreous
Refractive Index	n = 1.652 - 1.658 n = 1.704 - 1.710
Diaphaneity	Transparent, Translucent
Cleavage	PerfectPerfect on
Fracture	Irregular/Uneven, Conchoidal
Crystal Habit：Six sided prisms terminated by rhombohedrons to massive
Geological Setting：In the oxidized zone of some copper deposits.