Prehnite

Overview

Ca2Al2Si3O10(OH)2
Fluorescence: blue white to light orange under SW, yellow under LW	Not Radioactive	Magnetic: no

Description

Physical Properties

Property	Value
Density	2.8-2.95 g/cc
Hardness - Mohs	Prehnite - 6.0-6.5  10 Diamond 9 Carborundum 8 Topaz 7 Quartz 6 Orthoclase 5 Apatite 4 Fluorite 3 Calcite 2 Gypsum 1 Talc
Color	colorless, gray, yellow, yellow green, white
Streak	colorless

Crystal Properties

Property	Value
Crystal structure	orthorhombic - pyramidal
Cleavage	distinct
Tenacity	brittle
Fracture	brittle
Luster	vitreous, pearly

Similar Minerals

Dana Number : 72.01.03.01

Class: 72

Group: 72.01

Subgroup: 72.01.03 - prehnite

Dana Number	Mineral Name	Formula
72.01.03.01	prehnite	Ca2Al2Si3O10(OH)2

Nickel-Strunz Number : 09.DP.20

Group : 09

Subgroup : DP

Nickel-Strunz Number	Mineral Name	Formula
09.DP.20	prehnite	Ca2Al2Si3O10(OH)2

Specimens

Localities

Uses