Topaz

Overview

Al2SiO4(F,OH)2
Fluorescence: yellow under SW, cream under LW	Not Radioactive	Magnetic: no

Description

Physical Properties

Property	Value
Density	3.5-3.6 g/cc
Hardness - Mohs	Topaz - 8  10 Diamond 9 Carborundum 8 Topaz 7 Quartz 6 Orthoclase 5 Apatite 4 Fluorite 3 Calcite 2 Gypsum 1 Talc
Color	colorless, blue, yellow, brown, red
Streak	white

Crystal Properties

Property	Value
Crystal structure	orthorhombic - dipyramidal
Cleavage	perfect
Tenacity	-
Fracture	brittle
Luster	vitreous, glassy

Similar Minerals

Dana Number : 52.03.01.01

Class: 52

Group: 52.03

Subgroup: 52.03.01 - topaz

Dana Number	Mineral Name	Formula
52.03.01.01	topaz	Al2SiO4(F,OH)2

Nickel-Strunz Number : 09.AF.35

Group : 09

Subgroup : AF

Nickel-Strunz Number	Mineral Name	Formula
09.AF.35	topaz	Al2SiO4(F,OH)2

Specimens

Localities

Uses