Gehlenite

Overview

Ca2Al2(SiO7)
Fluorescence: none	Not Radioactive	Magnetic: no

Description

Physical Properties

Property	Value
Density	2.9-3.1 g/cc
Hardness - Mohs	Gehlenite - 5.0-6.0  10 Diamond 9 Carborundum 8 Topaz 7 Quartz 6 Orthoclase 5 Apatite 4 Fluorite 3 Calcite 2 Gypsum 1 Talc
Color	brown, colorless, green, gray, yellow
Streak	white

Crystal Properties

Property	Value
Crystal structure	tetragonal - scalenohedral
Cleavage	good
Tenacity	brittle
Fracture	uneven
Luster	vitreous, greasy

Similar Minerals

Dana Number : 55.304.01.02

Class: 55

Group: 55.304

Subgroup: 55.304.01 - melilite

Dana Number	Mineral Name	Formula
55.304.01.02	gehlenite	Ca2Al2(SiO7)

Nickel-Strunz Number : 09.BB.10

Group : 09

Subgroup : BB

Nickel-Strunz Number	Mineral Name	Formula
09.BB.10	gehlenite	Ca2Al2(SiO7)
09.BB.10	melilite	(Ca,Na)2(Al,Mg,Fe+2)(Si,Al)2O7

Specimens

Localities

Uses