Topaz facts for kids
A group of topaz crystals on matrix
|Crystal symmetry||Orthorhombic dipyramidal
H-M symbol: (2/m 2/m 2/m)
Space group: Pbnm
|Unit cell||a = 4.65 Å, b = 8.8 Å,
c = 8.4 Å; Z = 4
|Color||Colorless (if no impurities), blue, brown, orange, gray, yellow, green, pink and reddish pink|
|Mohs scale hardness||8 (defining mineral)|
|Birefringence||δ = 0.010|
Color and varieties
Pure topaz is colorless and transparent but they usually have colors. The typical topaz is wine, yellow, pale gray, reddish-orange, or blue brown. It can also be made white, pale green, blue, gold, or pink (rare).
Blue topaz is the US state Texas' gemstone.
Mystic topaz is colorless topaz which has been artificially coated, making it rainbow-colored.
Images for kids
Topaz Facts for Kids. Kiddle Encyclopedia.