Krieselite

Krieselite is a newly discovered naturally occurring mineral. Found in the Tsumeb mine in Tsumeb, Namibia at an unknown date and unknown depth, the mineral was first cataloged in 1994. Following the acceptance as a new mineral by the International Mineralogical Association in 2003, the material has been matched to unknown samples from the same mine in Namibia from 1972.[4]

Krieselite
Krieselite, from Tsumeb, Namibia
General
CategoryMineral
Formula
(repeating unit)
Al2GeO4(OH)2
Strunz classification9.AF.35
Dana classification75.01.03.01
Crystal systemOrthorhombic
Crystal classDipyramidal (mmm)
H-M symbol: (2/m 2/m 2/m)
Space groupPnma
Identification
Formula mass230.81 g/mol
ColorBeige to white
Crystal habitIsotypic with topaz
Mohs scale hardness5 12 - 6 12
LusterGreasy
StreakWhite
Density4.069 g/cm3
Optical propertiesBiaxial
Refractive indexNCalc= 1.81
Birefringenceδ = 0.000
References[1][2][3]

References


This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.