Crystal Topaz

Chemical Formula

Al₂SiO₄(F,OH)₂

Color

White, Colorless, Blue, Red, Green, Yellow, Orange, Brown, Pink, Purple, Gray, Multicolored

Hardness

8

Crystal System

Orthorhombic

Refractive Index

1.610 - 1.638

SG

3.4 - 3.6

Transparency

Transparent

Double Refraction

.014

Luster

Vitreous

Cleavage

1,3 - basal

Mineral Class

Topaz