| Tsumcorite | |
|---|---|
 Tsumcorite from the Tsumeb Mine, Namibia | |
| General | |
| Category | Arsenate minerals |
| Formula (repeating unit) | PbZnFe2+(AsO4)2.H2O |
| IMA symbol | Tmc[1] |
| Strunz classification | 8.CG.15 |
| Dana classification | 40.02.09.01 |
| Crystal system | Monoclinic |
| Crystal class | Prismatic (2/m) (same H-M symbol) |
| Space group | C2/m (no. 12) |
| Unit cell | a = 9.124 Å, b = 6.329 Å c = 7.577 Å; β = 115.3°; Z = 2 |
| Identification | |
| Formula mass | 624.29 g/mol |
| Color | Yellow-brown, red-brown, orange |
| Crystal habit | Radiating, fibrous crusts |
| Twinning | Common, on an unknown law |
| Cleavage | Good on {001} |
| Mohs scale hardness | 4+1⁄2 |
| Luster | Vitreous |
| Streak | Yellow |
| Diaphaneity | Translucent |
| Specific gravity | 5.2 |
| Optical properties | Biaxial |
| Refractive index | nα = 1.87–1.91 nβ = 1.89–1.93 nγ = 1.92–1.96 |
| Pleochroism | Weak, yellow to yellow-green |
| 2V angle | 67–83.5° |
| Solubility | Dissolves in HCl |
| References | [2][3][4][5][6][7] |
Tsumcorite is a rare hydrated lead arsenate mineral that was discovered in 1971, and reported by Geier, Kautz and Muller.[6] It was named after the TSUMeb CORporation mine at Tsumeb, in Namibia, in recognition of the Corporation's support for mineralogical investigations of the orebody at its Mineral Research Laboratory.[5]
- ^ 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.
- ^ Gaines et al (1997) Dana’s New Mineralogy Eighth Edition. Wiley
- ^ Mindat.org
- ^ Webmineral data
- ^ a b Handbook of Mineralogy
- ^ a b Fleischer M (1972) New mineral names, American Mineralogist 57, 1558, being a summary of Geier, Kautz and Muller (1971) Neues Jahrbuch für Mineralogie (Monatshefte) 1971: 304–309
- ^ Tillmanns, E.; Gebert, W. (1 December 1973). "The crystal structure of tsumcorite, a new mineral from the Tsumeb mine, S. W. Africa". Acta Crystallographica Section B: Structural Crystallography and Crystal Chemistry. 29 (12): 2789–2794. doi:10.1107/S0567740873007545.