type locality
Category Silicate mineral
(repeating unit)
Strunz classification 09.EC.80 Phyllosilicates
Dana classification
Color Colorless to white
Crystal habit Pseudohexagonal plates in spherical aggregates
Crystal system Monoclinic Space group: A2/m,A2,Am
Cleavage Perfect on {100}
Tenacity Extremely °exible
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 [1][2][3]

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.[1][3] It occurs in a deeply oxidized polymetallic ore deposits in Tsumeb. Associated minerals include quartz, galena, mimetite, hematite, leadhillite, anglesite, fleischerite, melanotekite and alamosite.[1] It has also been reported from the Zeehan district in Tasmania and from Tune, Sarpsberg, Østfold, Norway.[3]


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