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Mineralpedia Details for Feinglosite

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Feinglosite

Feinglosite

Named in honor of Dr. Mark N. Feinglos, an American medical researcher and mineral collector who specialized in Tsumeb minerals, where the mineral gets its type locality at the Tsumeb mine in Namibia, and was the first to discover the mineral in his studies. In addition to its type locality, Feinglosite can be found, debatably, at the Christiana mine in Laurion, Greece. It occurs as a secondary mineral in chalcocite cavities from the oxidized zone of polymetallic hydrothermal ore deposits in dolostone at its type occurrence.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/feinglosite.pdf

Formula
Pb2Zn(AsO4,SO4)2(OH,H2O) 
Crystal System
Monoclinic 
Luster
Adamantine 
Color
pale olive green 
Streak
white 
Class
Monoclinic 
Hardness
4-5 
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Feinglosite from Tsumeb mine, Tsumeb, Namibia

Feinglosite
            from Tsumeb mine, Tsumeb, Namibia

This specimen, as small as it is, is rich in the light olive green, globular crystals to about 0.3mm. According to Dr. Mark Feinglos there is very little Feinglosite around. This small fragment was split off the holotype. The major pieces are in the British Museum. 

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