Staurolite

Overview

(Fe+2,Mg)2Al9(Si,Al)4O20(O,OH)4
Fluorescence: none	Not Radioactive	Magnetic: no

Description

Physical Properties

Property	Value
Density	3.65-3.77 g/cc
Hardness - Mohs	Staurolite - 7.0-7.5  10 Diamond 9 Carborundum 8 Topaz 7 Quartz 6 Orthoclase 5 Apatite 4 Fluorite 3 Calcite 2 Gypsum 1 Talc
Color	yellow, black, brown
Streak	gray

Crystal Properties

Property	Value
Crystal structure	monoclinic - prismatic
Cleavage	distinct
Tenacity	brittle
Fracture	sub-conchoidal
Luster	vitreous, dull

Similar Minerals

Dana Number : 52.02.03.01

Class: 52

Group: 52.02

Subgroup: 52.02.03 - staurolite

Dana Number	Mineral Name	Formula
52.02.03.01	staurolite	(Fe+2,Mg)2Al9(Si,Al)4O20(O,OH)4
52.02.03.02	magnesiostaurolite	Mg4Al18Si8O40[O6,(OH)2]

Nickel-Strunz Number : 09.AF.30

Group : 09

Subgroup : AF

Nickel-Strunz Number	Mineral Name	Formula
09.AF.30	magnesiostaurolite	Mg4Al18Si8O40[O6,(OH)2]
09.AF.30	staurolite	(Fe+2,Mg)2Al9(Si,Al)4O20(O,OH)4

Specimens

Localities

Uses