Allophane

Overview

(Al2O3)(SiO2)1.3·2.5(H2O)
Fluorescence: blue under SW	Not Radioactive	Magnetic: no

Description

Physical Properties

Property	Value
Density	1.9 g/cc
Hardness - Mohs	Allophane - 3  10 Diamond 9 Carborundum 8 Topaz 7 Quartz 6 Orthoclase 5 Apatite 4 Fluorite 3 Calcite 2 Gypsum 1 Talc
Color	white, green, blue, yellow, brown
Streak	white

Crystal Properties

Property	Value
Crystal structure	amorphous - amorphous
Cleavage	none
Tenacity	-
Fracture	conchoidal
Luster	waxy

Similar Minerals

Dana Number : 71.01.04.01

Class: 71

Group: 71.01

Subgroup: 71.01.04 - allophane

Dana Number	Mineral Name	Formula
71.01.04.01	allophane	(Al2O3)(SiO2)1.3·2.5(H2O)

Nickel-Strunz Number : 09.ED.20

Group : 09

Subgroup : ED

Nickel-Strunz Number	Mineral Name	Formula
09.ED.20	allophane	(Al2O3)(SiO2)1.3·2.5(H2O)
09.ED.20	chrysocolla	(Cu,Al)2H2Si2O5(OH)4·n(H2O)

Specimens

Localities

Uses