Kornerupine

Overview

(Mg,Fe+2)4Al6(SiO4,BO4)5(O,OH)2
Fluorescence: none	Not Radioactive	Magnetic: no

Description

Physical Properties

Property	Value
Density	3.3-3.34 g/cc
Hardness - Mohs	Kornerupine - 7  10 Diamond 9 Carborundum 8 Topaz 7 Quartz 6 Orthoclase 5 Apatite 4 Fluorite 3 Calcite 2 Gypsum 1 Talc
Color	brown, colorless, green, yellow
Streak	white

Crystal Properties

Property	Value
Crystal structure	orthorhombic - dipyramidal
Cleavage	indistinct
Tenacity	brittle
Fracture	uneven
Luster	vitreous, glassy

Similar Minerals

Dana Number : 58.01.01.01

Class: 58

Group: 58.01

Subgroup: 58.01.01 - kornerupine

Dana Number	Mineral Name	Formula
58.01.01.01	kornerupine	(Mg,Fe+2)4Al6(SiO4,BO4)5(O,OH)2
58.01.01.02	prismatine	(Fe,Mg)(Mg,Al,Fe)5Al4Si2(Si,Al)2(B,Si,Al)(O,OH,F)22

Nickel-Strunz Number : 09.BJ.50

Group : 09

Subgroup : BJ

Nickel-Strunz Number	Mineral Name	Formula
09.BJ.50	kornerupine	(Mg,Fe+2)4Al6(SiO4,BO4)5(O,OH)2
09.BJ.50	prismatine	(Fe,Mg)(Mg,Al,Fe)5Al4Si2(Si,Al)2(B,Si,Al)(O,OH,F)22

Specimens

Localities

Uses