Large Topaz, Natural Etching, Mwami, Hurungwe, Zimbabwe

This is a beautiful Large Topaz, Natural Etching, from Mwami Hurungwe, Zimbabwe.

Crystal Dimensions: 

3cm (1.1”) x 2cm (0.7”)-

Weight: 

21 grams 

Topaz is a silicate mineral of aluminium and fluorine.

The chemical formula is

Al₂SiO₄(F, OH)₂