Blue Topaz, Mwami, Hurungwe, Zimbabwe

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

Crystal Dimensions: 

1cm (0.3”) x 1cm (0.3”) 

Weight: 

1.7 grams 

Topaz is a silicate mineral of aluminium and fluorine.

The chemical formula is

Al₂SiO₄(F, OH)₂