Demantoid

Overview

Ca3Fe+32(SiO4)3
Fluorescence: none	Not Radioactive	Magnetic: no

Description

Physical Properties

Property	Value
Density	3.7-4.1 g/cc
Hardness - Mohs	Demantoid - 6.5-7  10 Diamond 9 Carborundum 8 Topaz 7 Quartz 6 Orthoclase 5 Apatite 4 Fluorite 3 Calcite 2 Gypsum 1 Talc
Color	black, yellowish brown, red, greenish yellow, gray
Streak	white

Crystal Properties

Property	Value
Crystal structure	isometric - hexoctahedral
Cleavage	none
Tenacity	-
Fracture	conchoidal
Luster	vitreous, glassy

Similar Minerals

Dana Number : 51.04.03b.01

Class: 51

Group: 51.04

Subgroup: 51.04.03b - garnet

Dana Number	Mineral Name	Formula
51.04.03b.01	andradite	Ca3Fe+32(SiO4)3
51.04.03b.01	demantoid	Ca3Fe+32(SiO4)3
51.04.03b.02	grossular	Ca3Al2(SiO4)3
51.04.03b.02	hessonite	Ca3Al2(SiO4)3
51.04.03b.03	uvarovite	Ca3Cr2(SiO4)3
51.04.03b.04	goldmanite	Ca3(V,Al,Fe+3)2(SiO4)3

Nickel-Strunz Number : 09.AD.25

Group : 09

Subgroup : AD

Nickel-Strunz Number	Mineral Name	Formula
09.AD.25	almandine	Fe+23Al2(SiO4)3
09.AD.25	andradite	Ca3Fe+32(SiO4)3
09.AD.25	demantoid	Ca3Fe+32(SiO4)3
09.AD.25	goldmanite	Ca3(V,Al,Fe+3)2(SiO4)3
09.AD.25	grossular	Ca3Al2(SiO4)3
09.AD.25	hessonite	Ca3Al2(SiO4)3
09.AD.25	kimzeyite	Ca3(Zr,Ti)2(Si,Al,Fe+3)3O12
09.AD.25	pyrope	Mg3Al2(SiO4)3
09.AD.25	schorlomite	Ca3(Ti,Fe+3,Al)2((Si,Fe+3,Fe+2)O4)3
09.AD.25	spessartine	Mn+23Al2(SiO4)3
09.AD.25	uvarovite	Ca3Cr2(SiO4)3

Specimens

Localities

Uses