Topaz (mineral)

Topaz crystals, a selection of specimens of this crystallized mineral species. The topaz is a mineral, here many pieces of collection presented with a description, one or more photos and sometimes a video. These topazes are for sale. It is a silicate, subgroup of the nesosubsilicates, of chemical formula Al2SiO4(F,OH)2, and of orthorhombic crystal system.