Blue Topaz, Rainbow, Mwami, Hurungwe, Zimbabwe

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

Crystal Dimensions: 

2cm (0.7”) x 1.5cm (0.5”)

Weight: 

4.1 grams 

Topaz is a silicate mineral of aluminium and fluorine.

The chemical formula is

Al₂SiO₄(F, OH)₂