Gaudefroyite

Overview

Ca4Mn+33-x(BO3)3(CO3)(O,OH)3
Fluorescence: none	Not Radioactive	Magnetic: no

Description

Physical Properties

Property	Value
Density	3.35-3.5 g/cc
Hardness - Mohs	Gaudefroyite - 6  10 Diamond 9 Carborundum 8 Topaz 7 Quartz 6 Orthoclase 5 Apatite 4 Fluorite 3 Calcite 2 Gypsum 1 Talc
Color	black
Streak	brown

Crystal Properties

Property	Value
Crystal structure	hexagonal - pyramidal
Cleavage	none
Tenacity	brittle
Fracture	conchoidal
Luster	adamantine

Similar Minerals

Dana Number : 27.01.02.01

Class: 27

Group: 27.01

Subgroup: 27.01.02 - gaudefroyite

Dana Number	Mineral Name	Formula
27.01.02.01	gaudefroyite	Ca4Mn+33-x(BO3)3(CO3)(O,OH)3

Nickel-Strunz Number : 06.AB.60

Group : 06

Subgroup : AB

Nickel-Strunz Number	Mineral Name	Formula
06.AB.60	gaudefroyite	Ca4Mn+33-x(BO3)3(CO3)(O,OH)3

Specimens

Localities

Uses