Bannisterite

Overview

KCa(Mn,Fe+2,Zn,Mg)21(Si,Al)32O76(OH)16·4-12(H2O)
Fluorescence: none	Barely Detectable Radiation	Magnetic: no

Description

Physical Properties

Property	Value
Density	2.83-2.84 g/cc
Hardness - Mohs	Bannisterite - 4  10 Diamond 9 Carborundum 8 Topaz 7 Quartz 6 Orthoclase 5 Apatite 4 Fluorite 3 Calcite 2 Gypsum 1 Talc
Color	brown, black
Streak	-

Crystal Properties

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

Similar Minerals

Dana Number : 74.01.01.04

Class: 74

Group: 74.01

Subgroup: 74.01.01 - stilpnomelane

Dana Number	Mineral Name	Formula
74.01.01.01	stilpnomelane	K(Fe+2,Mg,Fe+3)8(Si,Al)12(O,OH)27·n(H2O)
74.01.01.04	bannisterite	KCa(Mn,Fe+2,Zn,Mg)21(Si,Al)32O76(OH)16·4-12(H2O)

Nickel-Strunz Number : 09.EG.75

Group : 09

Subgroup : EG

Nickel-Strunz Number	Mineral Name	Formula
09.EG.75	bannisterite	KCa(Mn,Fe+2,Zn,Mg)21(Si,Al)32O76(OH)16·4-12(H2O)

Specimens

Localities

Uses