Ahlfeldite

Overview

(Ni,Co)SeO3·2(H2O)
Fluorescence: none	Not Radioactive	Magnetic: mp

Description

Physical Properties

Property	Value
Density	3.37 g/cc
Hardness - Mohs	Ahlfeldite - 2.0-2.5  10 Diamond 9 Carborundum 8 Topaz 7 Quartz 6 Orthoclase 5 Apatite 4 Fluorite 3 Calcite 2 Gypsum 1 Talc
Color	brown, green, red
Streak	light green

Crystal Properties

Property	Value
Crystal structure	monoclinic - prismatic
Cleavage	distinct
Tenacity	brittle
Fracture	brittle
Luster	vitreous, glassy

Similar Minerals

Dana Number : 34.02.03.03

Class: 34

Group: 34.02

Subgroup: 34.02.03 - chalcomenite

Dana Number	Mineral Name	Formula
34.02.03.01	clinochalcomenite	CuSeO3·2(H2O)
34.02.03.02	cobaltomenite	Co(SeO3·2(H2O)
34.02.03.03	ahlfeldite	(Ni,Co)SeO3·2(H2O)

Nickel-Strunz Number : 04.JH.10

Group : 04

Subgroup : JH

Nickel-Strunz Number	Mineral Name	Formula
04.JH.10	ahlfeldite	(Ni,Co)SeO3·2(H2O)
04.JH.10	clinochalcomenite	CuSeO3·2(H2O)
04.JH.10	cobaltomenite	Co(SeO3·2(H2O)

Specimens

Localities

Uses