Birnessite

Overview

(Na,Ca,K)x(Mn+4,Mn+3)2O4·1.5(H2O)
Fluorescence: none	Barely Detectable Radiation	Magnetic: no

Description

Physical Properties

Property	Value
Density	3 g/cc
Hardness - Mohs	Birnessite - 1.5  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	-
Tenacity	-
Fracture	-
Luster	sub-metallic

Similar Minerals

Dana Number : 07.05.03.01

Class: 07

Group: 07.05

Subgroup: 07.05.03 - birnessite

Dana Number	Mineral Name	Formula
07.05.03.01	birnessite	(Na,Ca,K)x(Mn+4,Mn+3)2O4·1.5(H2O)

Nickel-Strunz Number : 04.FL.45

Group : 04

Subgroup : FL

Nickel-Strunz Number	Mineral Name	Formula
04.FL.45	birnessite	(Na,Ca,K)x(Mn+4,Mn+3)2O4·1.5(H2O)

Specimens

Localities

Uses