Roscoelite

Overview

K(V,Al,Mg)2AlSi3O10(OH)2
Fluorescence: none	Barely Detectable Radiation	Magnetic: no

Description

Physical Properties

Property	Value
Density	2.97 g/cc
Hardness - Mohs	Roscoelite - 2.5  10 Diamond 9 Carborundum 8 Topaz 7 Quartz 6 Orthoclase 5 Apatite 4 Fluorite 3 Calcite 2 Gypsum 1 Talc
Color	green, brown
Streak	greenish white

Crystal Properties

Property	Value
Crystal structure	monoclinic - prismatic
Cleavage	perfect
Tenacity	-
Fracture	-
Luster	Pearly

Similar Minerals

Dana Number : 71.02.02a.04

Class: 71

Group: 71.02

Subgroup: 71.02.02a - muscovite

Dana Number	Mineral Name	Formula
71.02.02a.01	muscovite	KAl3Si3O10(OH,F)2
71.02.02a.01	sericite	KAl3Si3O10(OH,F)2
71.02.02a.04	roscoelite	K(V,Al,Mg)2AlSi3O10(OH)2
71.02.02a.06	celadonite	K(Mg,Fe+2)(Fe+3,Al)(Si4O10)(OH)2

Nickel-Strunz Number : 09.EC.15

Group : 09

Subgroup : EC

Nickel-Strunz Number	Mineral Name	Formula
09.EC.15	celadonite	K(Mg,Fe+2)(Fe+3,Al)(Si4O10)(OH)2
09.EC.15	ganterite	(Ba0.5(Na,K)0.5)Al2(Si2.5Al1.5O10)(OH)2
09.EC.15	muscovite	KAl3Si3O10(OH,F)2
09.EC.15	roscoelite	K(V,Al,Mg)2AlSi3O10(OH)2
09.EC.15	sericite	KAl3Si3O10(OH,F)2

Specimens

Localities

Uses