Blue Topaz, Mwami, Hurungwe, Zimbabwe

This is a beautiful thumbnail size Blue Topaz from Mwami Hurungwe, Zimbabwe.

Crystal Dimensions: 

2.5cm (0.9”) x 1.5cm (0.5”) 

Weight: 

5.4 grams 

Topaz is a silicate mineral of aluminium and fluorine.

The chemical formula is

Al₂SiO₄(F, OH)₂