Sillimanite

Overview

Al2SiO5
Fluorescence: none	Not Radioactive	Magnetic: no

Description

Physical Properties

Property	Value
Density	3.24 g/cc
Hardness - Mohs	Sillimanite - 7  10 Diamond 9 Carborundum 8 Topaz 7 Quartz 6 Orthoclase 5 Apatite 4 Fluorite 3 Calcite 2 Gypsum 1 Talc
Color	blue, green, colorless, gray
Streak	white

Crystal Properties

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

Similar Minerals

Dana Number : 52.02.02a.01

Class: 52

Group: 52.02

Subgroup: 52.02.02a - sillimanite

Dana Number	Mineral Name	Formula
52.02.02a.01	sillimanite	Al2SiO5

Nickel-Strunz Number : 09.AF.05

Group : 09

Subgroup : AF

Nickel-Strunz Number	Mineral Name	Formula
09.AF.05	sillimanite	Al2SiO5

Specimens

Localities

Uses