Alum-(K)

Overview

Kal(SO4)2·12(H2O)
Fluorescence: none	Not Radioactive	Magnetic: no

Description

Physical Properties

Property	Value
Density	1.76 g/cc
Hardness - Mohs	Alum-(K) - 2  10 Diamond 9 Carborundum 8 Topaz 7 Quartz 6 Orthoclase 5 Apatite 4 Fluorite 3 Calcite 2 Gypsum 1 Talc
Color	colorless, white
Streak	white

Crystal Properties

Property	Value
Crystal structure	isometric - diploidal
Cleavage	indistinct
Tenacity
Fracture	conchoidal
Luster	vitreous, glassy

Similar Minerals

Dana Number : 29.05.05.01

Class: 29

Group: 29.05

Subgroup: 29.05.05 - alum

Dana Number	Mineral Name	Formula
29.05.05.01	alum-(K)	Kal(SO4)2·12(H2O)
29.05.05.03	tschermigite	(NH4)Al(SO4)2·12(H2O)

Nickel-Strunz Number : 07.CC.20

Group : 07

Subgroup : CC

Nickel-Strunz Number	Mineral Name	Formula
07.CC.20	alum-(K)	Kal(SO4)2·12(H2O)
07.CC.20	tschermigite	(NH4)Al(SO4)2·12(H2O)

Specimens

Localities

Uses