Germanite, probably from the Tsumeb Mine, Oshikoto Region, Namibia. Specimen size 5 cm
|Crystal class||Hextetrahedral (43m) |
H-M symbol: (4 3m)
|Color||Reddish grey tarnishing to dark brown|
|Crystal habit||Usually massive; rarely as minute cubic crystals|
|Mohs scale hardness||4|
|Streak||Dark grey to black|
|Specific gravity||4.4 to 4.6|
|Other characteristics||Cell data: a = 10.585 Å Z = 1|
Germanite is a rare copper iron germanium sulfide mineral, Cu26Fe4Ge4S32. It was first discovered in 1922, and named for its germanium content. It is only a minor source of this important semiconductor element, which is mainly derived from the processing of the zinc sulfide mineral sphalerite. Germanite contains gallium, zinc, molybdenum, arsenic, and vanadium as impurities.
Its type locality is the Tsumeb Mine in Namibia where it occurs in a hydrothermal polymetallic ore deposit in dolomite in association with renierite, pyrite, tennantite, enargite, galena, sphalerite, digenite, bornite and chalcopyrite. It has also been reported from Argentina , Armenia, Bulgaria, Cuba, Democratic Republic of Congo (Zaire), Finland , France , Greece, Japan , Republic of Congo (Brazzaville), Russia and the United States .
|X-Ray Powder Diffraction|
- American Mineralogist (1984) 69:943-947
- http://www.mindat.org/min-1681.html Mindat.org
- http://webmineral.com/data/Germanite.shtml Webmineral
- http://rruff.geo.arizona.edu/doclib/hom/germanite.pdf Handbook of Mineralogy
- Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine 85 (3): 291–320. doi:10.1180/mgm.2021.43. Bibcode: 2021MinM...85..291W. https://www.cambridge.org/core/journals/mineralogical-magazine/article/imacnmnc-approved-mineral-symbols/62311F45ED37831D78603C6E6B25EE0A.
- U.S. Geological Survey (2008), "Germanium—Statistics and Information", U.S. Geological Survey, Mineral Commodity Summaries http://minerals.usgs.gov/minerals/pubs/commodity/germanium/
- Dana's New Mineralogy, 8th edition, Gaines et al., Wiley
Original source: https://en.wikipedia.org/wiki/Germanite. Read more