| Kegelite | |
|---|---|
 Kegelite microcrystals with a 1 cm. siderite crystal at right, from the type locality | |
| General | |
| Category | Phyllosilicates |
| Formula (repeating unit) | Pb8Al4Si8O20(SO4)2(CO3)4(OH)8 |
| IMA symbol | Keg |
| Strunz classification | 9.EC.80 |
| Dana classification | 71.05.01.01 |
| Crystal system | Monoclinic Unknown space group |
| Identification | |
| Color | Colorless to white |
| Crystal habit | Pseudohexagonal plates in spherical aggregates |
| Cleavage | Perfect on {100} |
| Tenacity | Extremely flexible |
| Mohs scale hardness | no data |
| Luster | Vitreous |
| Streak | White |
| Diaphaneity | Transparent to translucent |
| Specific gravity | 4.5 |
| Optical properties | Biaxial (-) |
| Refractive index | n = 1.81 parallel to {100} |
| References | |
Kegelite is a complex silicate mineral with formula Pb8Al4Si8O20(SO4)2(CO3)4(OH)8.
It was first described in 1975 for an occurrence in the Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia and named for Friedrich Wilhelm Kegel (?-1948), Director of mining operations at Tsumeb. It occurs in a deeply oxidized polymetallic ore deposits in Tsumeb. Associated minerals include quartz, galena, mimetite, hematite, leadhillite, anglesite, fleischerite, melanotekite and alamosite. It has also been reported from the Zeehan district in Tasmania and from Tune, Sarpsborg, Østfold, Norway.
References
- 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.
- ^ http://rruff.geo.arizona.edu/doclib/hom/kegelite.pdf Handbook of Mineralogy
- http://www.webmineral.com/data/Kegelite.shtml Webmineral data
- ^ http://www.mindat.org/min-2175.html Mindat.org
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