Glaucophane

Overview

Na2(Mg3Al2)Si8O22(OH)2
Fluorescence: none	Not Radioactive	Magnetic: no

Description

Physical Properties

Property	Value
Density	3-3.15 g/cc
Hardness - Mohs	Glaucophane - 6.0-6.5  10 Diamond 9 Carborundum 8 Topaz 7 Quartz 6 Orthoclase 5 Apatite 4 Fluorite 3 Calcite 2 Gypsum 1 Talc
Color	gray, black, blue
Streak	grayish blue

Crystal Properties

Property	Value
Crystal structure	monoclinic - prismatic
Cleavage	good
Tenacity	brittle
Fracture	conchoidal
Luster	vitreous, pearly

Similar Minerals

Dana Number : 66.01.03c.01

Class: 66

Group: 66.01

Subgroup: 66.01.03c - sodic amphiboles

Dana Number	Mineral Name	Formula
66.01.03c.01	glaucophane	Na2(Mg3Al2)Si8O22(OH)2
66.01.03c.04	magnesioriebeckite	Na2((Mg,Fe+2)3Fe+32)Si8O22(OH)2
66.01.03c.09	arfvedsonite	Na3(Fe+24,Fe+3)(Si8O22)(OH)2

Nickel-Strunz Number : 09.DE.25

Group : 09

Subgroup : DE

Nickel-Strunz Number	Mineral Name	Formula
09.DE.25	arfvedsonite	Na3(Fe+24,Fe+3)(Si8O22)(OH)2
09.DE.25	glaucophane	Na2(Mg3Al2)Si8O22(OH)2
09.DE.25	magnesioriebeckite	Na2((Mg,Fe+2)3Fe+32)Si8O22(OH)2

Specimens

Localities

Uses