Hollandite

Overview

Ba(Mn+4,Mn+2)8O16
Fluorescence: none	Not Radioactive	Magnetic: no

Description

Physical Properties

Property	Value
Density	4.7-5.0 g/cc
Hardness - Mohs	Hollandite - 4.0-6.0  10 Diamond 9 Carborundum 8 Topaz 7 Quartz 6 Orthoclase 5 Apatite 4 Fluorite 3 Calcite 2 Gypsum 1 Talc
Color	gray, black, silver
Streak	black

Crystal Properties

Property	Value
Crystal structure	monoclinic - prismatic
Cleavage	good
Tenacity	brittle
Fracture	brittle
Luster	earthy

Similar Minerals

Dana Number : 07.09.01.01

Class: 07

Group: 07.09

Subgroup: 07.09.01 - cryptomelane

Dana Number	Mineral Name	Formula
07.09.01.01	hollandite	Ba(Mn+4,Mn+2)8O16
07.09.01.03	manjiroite	(Na,K)(Mn+4,Mn+2)8O16·n(H2O)

Nickel-Strunz Number : 04.DK.05

Group : 04

Subgroup : DK

Nickel-Strunz Number	Mineral Name	Formula
04.DK.05	hollandite	Ba(Mn+4,Mn+2)8O16
04.DK.05	manjiroite	(Na,K)(Mn+4,Mn+2)8O16·n(H2O)
04.DK.05	redledgeite	BaTi6Cr+32O16·(H2O)

Specimens

Localities

Uses