Aenigmatite

Overview

(Na,Ca)4(Fe+2,Ti,Mg)12Si12O40
Fluorescence: none	Not Radioactive	Magnetic: no

Description

Physical Properties

Property	Value
Density	3.74-3.85 g/cc
Hardness - Mohs	Aenigmatite - 5.0-6  10 Diamond 9 Carborundum 8 Topaz 7 Quartz 6 Orthoclase 5 Apatite 4 Fluorite 3 Calcite 2 Gypsum 1 Talc
Color	brown, black
Streak	reddish brown

Crystal Properties

Property	Value
Crystal structure	triclinic - pinacoidal
Cleavage	perfect
Tenacity	brittle
Fracture	irregular
Luster	sub-adamantine

Similar Minerals

Dana Number : 69.02.01a.01

Class: 69

Group: 69.02

Subgroup: 69.02.01a - aenigmatite

Dana Number	Mineral Name	Formula
69.02.01a.01	aenigmatite	(Na,Ca)4(Fe+2,Ti,Mg)12Si12O40
69.02.01a.03	høgtuvaite	(Ca,Na)2(Fe+2,Fe+3,Ti,Mg,Mn)6(Si,Be,Al)6O20
69.02.01a.06	serendibite	Ca2(Mg,Al)6(Si,Al,B)6O20
69.02.01a.09	makarochkinite	Ca2Fe+24Fe+3TiSi4BeAlO20

Nickel-Strunz Number : 09.DH.45

Group : 09

Subgroup : DH

Nickel-Strunz Number	Mineral Name	Formula
09.DH.45	aenigmatite	(Na,Ca)4(Fe+2,Ti,Mg)12Si12O40
09.DH.45	makarochkinite	Ca2Fe+24Fe+3TiSi4BeAlO20
09.DH.45	sapphirine	(Mg,Al)8(Al,Si)6O20
09.DH.45	serendibite	Ca2(Mg,Al)6(Si,Al,B)6O20

Specimens

Localities

Uses