Cryolite

Overview

Na3AlF6
Fluorescence: blue white under SW	Not Radioactive	Magnetic: no

Description

Physical Properties

Property	Value
Density	2.95-3 g/cc
Hardness - Mohs	Cryolite - 2.5-3  10 Diamond 9 Carborundum 8 Topaz 7 Quartz 6 Orthoclase 5 Apatite 4 Fluorite 3 Calcite 2 Gypsum 1 Talc
Color	black, colorless, gray, white, brown
Streak	white

Crystal Properties

Property	Value
Crystal structure	monoclinic - prismatic
Cleavage	none
Tenacity	-
Fracture	uneven
Luster	vitreous, greasy

Similar Minerals

Dana Number : 11.06.01.01

Class: 11

Group: 11.06

Subgroup: 11.06.01 - cryolite

Dana Number	Mineral Name	Formula
11.06.01.01	cryolite	Na3AlF6

Nickel-Strunz Number : 03.CB.15

Group : 03

Subgroup : CB

Nickel-Strunz Number	Mineral Name	Formula
03.CB.15	cryolite	Na3AlF6

Specimens

Localities

Uses