Topaz is an aluminum silicate fluoride hydroxide crystal with a hardness of 8. Its crystal structure is orthorhombic, and it frequently forms prismatic crystals. The name topaz may derive from the Sanskrit word tapaz, which means “fire.”
Colorado Mineral & Fossil Show (Fall)
September 9 – 15, 2013
Ramada Plaza Hotel (formerly Holiday Inn)
4849 Bannock St.
Denver, CO 80216-1813