Gismondine

Overview

Ca2Al4Si4O16·9(H2O)
Fluorescence: none	Not Radioactive	Magnetic: no

Description

Physical Properties

Property	Value
Density	2.26 g/cc
Hardness - Mohs	Gismondine - 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	blue, white, colorless, gray, red
Streak	white

Crystal Properties

Property	Value
Crystal structure	monoclinic - prismatic
Cleavage	imperfect
Tenacity
Fracture	conchoidal
Luster	vitreous, glassy

Similar Minerals

Dana Number : 77.01.03.01

Class: 77

Group: 77.01

Subgroup: 77.01.03 - gismondine

Dana Number	Mineral Name	Formula
77.01.03.01	gismondine	Ca2Al4Si4O16·9(H2O)
77.01.03.03	garronite	Na2Ca5Al12Si20O64·27(H2O)
77.01.03.04	gobbinsite	(Na2,Ca)2K2Al6Si10O32·12(H2O)
77.01.03.05	harmotome	(Ba,Na,K)1-2(Si,Al)8O16·6(H2O)
77.01.03.06a	phillipsite-(Ca)	(Ca,K,Na)1-2(Si,Al)8O16·6(H2O)
77.01.03.06b	phillipsite-(K)	(K,Na,Ca)1-2(Si,Al)8O16·6(H2O)
77.01.03.08	perlialite	K8Tl4Al12Si24O72·20(H2O)
77.01.03.12	montesommaite	(K,Na)9Al9Si23O64·10(H2O)

Nickel-Strunz Number : 09.GC.05

Group : 09

Subgroup : GC

Nickel-Strunz Number	Mineral Name	Formula
09.GC.05	garronite	Na2Ca5Al12Si20O64·27(H2O)
09.GC.05	gismondine	Ca2Al4Si4O16·9(H2O)
09.GC.05	gobbinsite	(Na2,Ca)2K2Al6Si10O32·12(H2O)

Specimens

Localities

Uses