Lawsonite

Overview

CaAl2(Si2O7)(OH)2·(H2O)
Fluorescence: none	Not Radioactive	Magnetic: no

Description

Physical Properties

Property	Value
Density	3.09 g/cc
Hardness - Mohs	Lawsonite - 7.5  10 Diamond 9 Carborundum 8 Topaz 7 Quartz 6 Orthoclase 5 Apatite 4 Fluorite 3 Calcite 2 Gypsum 1 Talc
Color	colorless, white, gray, blue, pink
Streak	white

Crystal Properties

Property	Value
Crystal structure	orthorhombic - dipyramidal
Cleavage	perfect
Tenacity	brittle
Fracture	uneven
Luster	vitreous, greasy

Similar Minerals

Dana Number : 56.02.03.01

Class: 56

Group: 56.02

Subgroup: 56.02.03 - lawsonite

Dana Number	Mineral Name	Formula
56.02.03.01	chromian lawsonite	Ca(Al,Cr)2(Si2O7)(OH)2·(H2O)
56.02.03.01	lawsonite	CaAl2(Si2O7)(OH)2·(H2O)
56.02.03.03	ilvaite	CaFe+22Fe+3(SiO4)2(OH)

Nickel-Strunz Number : 09.BE.05

Group : 09

Subgroup : BE

Nickel-Strunz Number	Mineral Name	Formula
09.BE.05	chromian lawsonite	Ca(Al,Cr)2(Si2O7)(OH)2·(H2O)
09.BE.05	lawsonite	CaAl2(Si2O7)(OH)2·(H2O)

Specimens

Localities

Uses