Pyrophyllite

Overview

Al2Si4O10(OH)2
Fluorescence: yellow under LW	Not Radioactive	Magnetic: no

Description

Physical Properties

Property	Value
Density	2.8-2.9 g/cc
Hardness - Mohs	Pyrophyllite - 1.5-2  10 Diamond 9 Carborundum 8 Topaz 7 Quartz 6 Orthoclase 5 Apatite 4 Fluorite 3 Calcite 2 Gypsum 1 Talc
Color	brown, green yellow, gray
Streak	white

Crystal Properties

Property	Value
Crystal structure	triclinic - pinacoidal
Cleavage	perfect
Tenacity	flexible
Fracture	flexible
Luster	pearly

Similar Minerals

Dana Number : 71.02.01.01

Class: 71

Group: 71.02

Subgroup: 71.02.01 - pyrophyllite

Dana Number	Mineral Name	Formula
71.02.01.01	pyrophyllite	Al2Si4O10(OH)2
71.02.01.03	talc	Mg3Si4O10(OH)2
71.02.01.05	minnesotaite	(Fe+2,Mg)3Si4O10(OH)2

Nickel-Strunz Number : 09.EC.10

Group : 09

Subgroup : EC

Nickel-Strunz Number	Mineral Name	Formula
09.EC.10	pyrophyllite	Al2Si4O10(OH)2

Specimens

Localities

Uses