Coffinite

Overview

U(SiO4)1-x(OH)4x
Fluorescence: none	Very Strongly Radioactive	Magnetic: no

Description

Physical Properties

Property	Value
Density	5.1 g/cc
Hardness - Mohs	Coffinite - 5.0-6.0  10 Diamond 9 Carborundum 8 Topaz 7 Quartz 6 Orthoclase 5 Apatite 4 Fluorite 3 Calcite 2 Gypsum 1 Talc
Color	black, brown
Streak	grayish black

Crystal Properties

Property	Value
Crystal structure	tetragonal - ditetragonal dipyramidal
Cleavage	none
Tenacity	-
Fracture	brittle
Luster	subadamantine

Similar Minerals

Dana Number : 51.05.02.04

Class: 51

Group: 51.05

Subgroup: 51.05.02 - zircon

Dana Number	Mineral Name	Formula
51.05.02.01	zircon	ZrSiO4
51.05.02.03	thorite	ThSiO4
51.05.02.04	coffinite	U(SiO4)1-x(OH)4x

Nickel-Strunz Number : 09.AD.30

Group : 09

Subgroup : AD

Nickel-Strunz Number	Mineral Name	Formula
09.AD.30	coffinite	U(SiO4)1-x(OH)4x
09.AD.30	thorite	ThSiO4
09.AD.30	zircon	ZrSiO4

Specimens

Localities

Uses