Dioptase
ID: 9
Dioptase
Chemical Formula
CuSiO₃·H₂O
Hardness (Mohs)
5
Crystal System
Trigonal
Streak
Green
Luster
Sub-Adamantine, Vitreous, Sub-Vitreous
Diaphaneity
Transparent to translucent
Color
Emerald Green, Blue-Green
Crystal Habit / Mode of Occurrence
Prismatic. Bright emerald-green modified rhombohedral usually elongated crystals, usually less than 0.75 cm in size.
Fun Facts
Dioptase is prized for its intense emerald green color and is a favorite among mineral collectors.