Laumontite

Overview

CaAl2Si4O12·4(H2O)
Fluorescence: weak white under SW and LW	Not Radioactive	Magnetic: no

Description

Physical Properties

Property	Value
Density	2.25-2.35 g/cc
Hardness - Mohs	Laumontite - 3.5-4.0  10 Diamond 9 Carborundum 8 Topaz 7 Quartz 6 Orthoclase 5 Apatite 4 Fluorite 3 Calcite 2 Gypsum 1 Talc
Color	brownish, gray, yellow, white, pink
Streak	white

Crystal Properties

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

Similar Minerals

Dana Number : 77.01.01.04

Class: 77

Group: 77.01

Subgroup: 77.01.01 - analcime

Dana Number	Mineral Name	Formula
77.01.01.01	analcime	NaAlSi2O6·(H2O)
77.01.01.02	pollucite	(Cs,Na)2Al2Si4O12·(H2O)
77.01.01.03	wairakite	CaAl2Si4O12·2(H2O)
77.01.01.04	laumontite	CaAl2Si4O12·4(H2O)

Nickel-Strunz Number : 09.GB.10

Group : 09

Subgroup : GB

Nickel-Strunz Number	Mineral Name	Formula
09.GB.10	laumontite	CaAl2Si4O12·4(H2O)

Specimens

Localities

Uses