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Krieselite 
Summary
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 | |
| Category | Mineral |
| Formula (repeating unit) | Al2GeO4(OH)2 |
| IMA symbol | Kes[1] |
| 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 | 5+1⁄2 - 6+1⁄2 |
| Luster | Greasy |
| Streak | White |
| Density | 4.069 g/cm3 |
| Optical properties | Biaxial |
| Refractive index | NCalc= 1.81 |
| Birefringence | δ = 0.000 |
| References | [2][3][4] |
References edit
- ^ 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.
- ^ "Krieselite Mineral Data".
- ^ "Krieselite".
- ^ "ATHENA MINERAL: Mineral Data; Pierre Perroud".
- ^ 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.