Dioptase

Dioptase – CuSiO₃·H₂O

Elements: Copper, Silicon, Oxygen, Hydrogen

Class: Silicates – Cyclosilicates

Crystal System: Hexagonal

Hardness: 5

Apatite

Talc (1)Diamond (10)

About as hard as a steel knife blade.

Origin: Kimbedi, Mindouli District, Pool Department – Congo (drc)

More Hexagonal specimens