Dioptase Crystals On Calcite

Dioptase | ‪#‎Geology

Formula: CuSiO3 · H2O
System: Trigonal
Colour: Emerald Green, blue-green
Lustre: Vitreous
Hardness: 5

Locality: Tantara Mine, Kakounde, Likasi, Shaba Congo D.R.

by usageology on Flickr.