Psilomelane

Overview

(Ba,H2O)2(Mn+4,Mn+3)5O10·(H2O)
Fluorescence: none	Not Radioactive	Magnetic: no

Description

Physical Properties

Property	Value
Density	6.45 g/cc
Hardness - Mohs	Psilomelane - 5.0-6.0  10 Diamond 9 Carborundum 8 Topaz 7 Quartz 6 Orthoclase 5 Apatite 4 Fluorite 3 Calcite 2 Gypsum 1 Talc
Color	grey black, black
Streak	brown black

Crystal Properties

Property	Value
Crystal structure	monoclinic - prismatic
Cleavage	none
Tenacity	-
Fracture	-
Luster	sub-metallic

Similar Minerals

Dana Number : 07.09.02.00

Class: 07

Group: 07.09

Subgroup: 07.09.02 - romanechite

Dana Number	Mineral Name	Formula
07.09.02.00	psilomelane	(Ba,H2O)2(Mn+4,Mn+3)5O10·(H2O)
07.09.02.01	romanèchite	(Ba,H2O)2(Mn+4,Mn+3)5O10·(H2O)

Nickel-Strunz Number : 04.DK.10

Group : 04

Subgroup : DK

Nickel-Strunz Number	Mineral Name	Formula
04.DK.10	psilomelane	(Ba,H2O)2(Mn+4,Mn+3)5O10·(H2O)
04.DK.10	romanèchite	(Ba,H2O)2(Mn+4,Mn+3)5O10·(H2O)
04.DK.10	todorokite	(Na,Ca,K)2(Mn+4,Mn+3)6O12·3-4.5(H2O)

Specimens

Localities

Uses