Gonnardite

Overview

Na2CaAl4Si6O20·7(H2O)
Fluorescence: none	Not Radioactive	Magnetic: no

Description

Physical Properties

Property	Value
Density	2.3 g/cc
Hardness - Mohs	Gonnardite - 4.0-5.0  10 Diamond 9 Carborundum 8 Topaz 7 Quartz 6 Orthoclase 5 Apatite 4 Fluorite 3 Calcite 2 Gypsum 1 Talc
Color	white
Streak	white

Crystal Properties

Property	Value
Crystal structure	tetragonal - scalenohedral
Cleavage	perfect
Tenacity	-
Fracture	-
Luster	vitreous, glassy

Similar Minerals

Dana Number : 77.01.05.07

Class: 77

Group: 77.01

Subgroup: 77.01.05 - natrolite

Dana Number	Mineral Name	Formula
77.01.05.01	natrolite	Na2(Al2Si3O10)·2(H2O)
77.01.05.05	scolecite	CaAl2Si3O10·3(H2O)
77.01.05.07	gonnardite	Na2CaAl4Si6O20·7(H2O)
77.01.05.09	thomsonite-(Ca)	NaCa2Al5Si5O20·6(H2O)
77.01.05.10	thomsonite-(Sr)	(Sr,Ca)2Na(Al5Si5O20)·7(H2O)

Nickel-Strunz Number : 09.GA.05

Group : 09

Subgroup : GA

Nickel-Strunz Number	Mineral Name	Formula
09.GA.05	gonnardite	Na2CaAl4Si6O20·7(H2O)
09.GA.05	natrolite	Na2(Al2Si3O10)·2(H2O)
09.GA.05	scolecite	CaAl2Si3O10·3(H2O)

Specimens

Localities

Uses