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.[5]

Krieselite
Krieselite, from Tsumeb, Namibia
General
CategoryMineral
Formula
(repeating unit)
Al2GeO4(OH)2
IMA symbolKes[1]
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[2][3][4]

References

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  1. ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
  2. ^ "Krieselite Mineral Data".
  3. ^ "Krieselite".
  4. ^ "ATHENA MINERAL: Mineral Data; Pierre Perroud".
  5. ^ Schlüter, Jochen; Geisler, Thorsten; Pohl, Dieter; Stephan, Thomas (1 March 2010). "Krieselite, Al2GeO4(F,OH)2: A new mineral from the Tsumeb mine, Namibia, representing the Ge analogue of topaz". Neues Jahrbuch für Mineralogie - Abhandlungen. 187 (1): 33–40. doi:10.1127/0077-7757/2010/0160.