Sewardite

Overview

CaFe+32(AsO4)2(OH)2
Fluorescence: none	Not Radioactive	Magnetic: no

Description

Physical Properties

Property	Value
Density	- g/cc
Hardness - Mohs	Sewardite - 3.5  10 Diamond 9 Carborundum 8 Topaz 7 Quartz 6 Orthoclase 5 Apatite 4 Fluorite 3 Calcite 2 Gypsum 1 Talc
Color	red, orange
Streak	reddish brown

Crystal Properties

Property	Value
Crystal structure	orthorhombic - dipyramidal
Cleavage	imperfect
Tenacity	-
Fracture	splintery
Luster	vitreous, glassy

Similar Minerals

Dana Number : 41.10.06.02

Class: 41

Group: 41.10

Subgroup: 41.10.06 - carminite

Dana Number	Mineral Name	Formula
41.10.06.01	carminite	PbFe+32(AsO4)2(OH)2
41.10.06.02	sewardite	CaFe+32(AsO4)2(OH)2

Nickel-Strunz Number : 08.BH.30

Group : 08

Subgroup : BH

Nickel-Strunz Number	Mineral Name	Formula
08.BH.30	carminite	PbFe+32(AsO4)2(OH)2
08.BH.30	sewardite	CaFe+32(AsO4)2(OH)2

Specimens

Localities

Uses