Cobalt arthurite

Overview

CoFe+32(AsO4)2(OH)2·4(H2O)
Fluorescence: none	Not Radioactive	Magnetic: no

Description

Physical Properties

Property	Value
Density	3.22 g/cc
Hardness - Mohs	Cobalt arthurite - 3.5-4.0  10 Diamond 9 Carborundum 8 Topaz 7 Quartz 6 Orthoclase 5 Apatite 4 Fluorite 3 Calcite 2 Gypsum 1 Talc
Color	yellow, brown
Streak	light brownish white

Crystal Properties

Property	Value
Crystal structure	monoclinic - prismatic
Cleavage	none
Tenacity	brittle
Fracture	brittle
Luster	vitreous, silky

Similar Minerals

Dana Number : 42.11.18.06

Class: 42

Group: 42.11

Subgroup: 42.11.18 - whitmoreite

Dana Number	Mineral Name	Formula
42.11.18.01	whitmoreite	Fe+2Fe+32(PO4)2(OH)2·4(H2O)
42.11.18.02	arthurite	CuFe+32(AsO4,PO4,SO4)2(O,OH)2·4(H2O)
42.11.18.06	cobalt arthurite	CoFe+32(AsO4)2(OH)2·4(H2O)

Nickel-Strunz Number : 08.DC.15

Group : 08

Subgroup : DC

Nickel-Strunz Number	Mineral Name	Formula
08.DC.15	arthurite	CuFe+32(AsO4,PO4,SO4)2(O,OH)2·4(H2O)
08.DC.15	cobalt arthurite	CoFe+32(AsO4)2(OH)2·4(H2O)
08.DC.15	whitmoreite	Fe+2Fe+32(PO4)2(OH)2·4(H2O)

Specimens

Localities

Uses