Krieselite

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Krieselite
Krieselite.jpg
Krieselite, from Tsumeb, Namibia
General
Category Mineral
Formula
(repeating unit)
Al2GeO4(OH)2
Strunz classification 9.AF.35
Dana classification 75.01.03.01
Crystal system Orthorhombic
Crystal class Dipyramidal (mmm)
H-M symbol: (2/m 2/m 2/m)
Space group Pnma
Identification
Formula mass 230.81 g/mol
Color Beige to white
Crystal habit Isotypic with topaz
Mohs scale hardness 5½ - 6½
Luster Greasy
Streak White
Density 4.069 g/cm3
Optical properties Biaxial
Refractive index NCalc= 1.81
Birefringence δ = 0.000
References [1][2][3]

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]

References[edit]