Armstrongite

Overview

CaZrSi6O15·3(H2O)
Fluorescence: none	Not Radioactive	Magnetic: no

Description

Physical Properties

Property	Value
Density	4.5 g/cc
Hardness - Mohs	Armstrongite - 2.7-2.71  10 Diamond 9 Carborundum 8 Topaz 7 Quartz 6 Orthoclase 5 Apatite 4 Fluorite 3 Calcite 2 Gypsum 1 Talc
Color	brown, reddish brown
Streak	brownish white

Crystal Properties

Property	Value
Crystal structure	monoclinic - sphenoidal
Cleavage	perfect
Tenacity	brittle
Fracture	brittle
Luster	vitreous, glassy

Similar Minerals

Dana Number : 72.05.04.01

Class: 72

Group: 72.05

Subgroup: 72.05.04 - elpidite

Dana Number	Mineral Name	Formula
72.05.04.01	armstrongite	CaZrSi6O15·3(H2O)
72.05.04.02	elpidite	Na2ZrSi6O15·3(H2O)

Nickel-Strunz Number : 09.EA.35

Group : 09

Subgroup : EA

Nickel-Strunz Number	Mineral Name	Formula
09.EA.35	armstrongite	CaZrSi6O15·3(H2O)

Specimens

Localities

Uses