Boltwoodite

Overview

HK(IO2)(SiO4)·1.5(H2O)
Fluorescence: dull green under SW and LW	Very Strongly Radioactive	Magnetic: no

Description

Physical Properties

Property	Value
Density	4.7 g/cc
Hardness - Mohs	Boltwoodite - 3.5-4.0  10 Diamond 9 Carborundum 8 Topaz 7 Quartz 6 Orthoclase 5 Apatite 4 Fluorite 3 Calcite 2 Gypsum 1 Talc
Color	yellow
Streak	white

Crystal Properties

Property	Value
Crystal structure	monoclinic - sphenoidal
Cleavage	perfect
Tenacity	brittle
Fracture	uneven
Luster	vitreous, pearly

Similar Minerals

Dana Number : 53.03.01.05

Class: 53

Group: 53.03

Subgroup: 53.03.01 - uranophane

Dana Number	Mineral Name	Formula
53.03.01.01	kasolite	Pb(UO2)(SiO4)·(H2O)
53.03.01.02	uranophane	Ca(UO2)2SiO3(OH)2·5(H2O)
53.03.01.03	sklodowskite	(H3O)2Mg(UO2)2(SiO4)2·4(H2O)
53.03.01.04	cuprosklodowskite	Cu((UO2)(SiO2OH))2·6(H2O)
53.03.01.05	boltwoodite	HK(IO2)(SiO4)·1.5(H2O)

Nickel-Strunz Number : 09.AK.15

Group : 09

Subgroup : AK

Nickel-Strunz Number	Mineral Name	Formula
09.AK.15	boltwoodite	HK(IO2)(SiO4)·1.5(H2O)
09.AK.15	kasolite	Pb(UO2)(SiO4)·(H2O)
09.AK.15	uranophane	Ca(UO2)2SiO3(OH)2·5(H2O)

Specimens

Localities

Uses