Dravite

Overview

NaMg3Al6(BO3)3Si6O18(OH)4
Fluorescence: yellow to orange under SW	Not Radioactive	Magnetic: no

Description

Physical Properties

Property	Value
Density	2.98-3.2 g/cc
Hardness - Mohs	Dravite - 7-7.5  10 Diamond 9 Carborundum 8 Topaz 7 Quartz 6 Orthoclase 5 Apatite 4 Fluorite 3 Calcite 2 Gypsum 1 Talc
Color	black, green, red, blue, white
Streak	colorless

Crystal Properties

Property	Value
Crystal structure	trigonal - ditrigonal pyramidal
Cleavage	indistinct
Tenacity	brittle
Fracture	conchoidal
Luster	vitreous, resinous

Similar Minerals

Dana Number : 61.03e.01.09

Class: 61

Group: 61.03e

Subgroup: 61.03e.01 - schorl

Dana Number	Mineral Name	Formula
61.03e.01.09	dravite	NaMg3Al6(BO3)3Si6O18(OH)4

Nickel-Strunz Number : 09.CK.05

Group : 09

Subgroup : CK

Nickel-Strunz Number	Mineral Name	Formula
09.CK.05	buergerite	NaFe+33Al6(BO3)3Si6O21F
09.CK.05	dravite	NaMg3Al6(BO3)3Si6O18(OH)4
09.CK.05	elbaite	Na(Li,Al)3Al6(BO3)3Si6O18(OH)4
09.CK.05	foitite	Na0.5(Fe+2,Al)3Al6Si6O18(BO3)(OH)4
09.CK.05	magnesiofoitite	(Mg2Al)Al6(Si6O18)(BO3)3(OH)4
09.CK.05	tsilaisite	Na(Li,Al)3Al6(BO3)3Si6O18(OH)4
09.CK.05	uvite	(Ca,Na)(Mg,Fe+2)3Al5Mg(BO3)3Si6O18(OH,F)4

Specimens

Localities

Uses