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Mineralpedia Details for Teallite

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Teallite

Teallite

Named for Jethro Justinian Harris Teall, who was the Director of the Geological Survey of Great Britian and Ireland.  This hydrothermal mineral can be found in tin veins and can be a locally important tin ore mineral in some places. Found in only a few localities worldwide, a large number of specimens that have been identified as Teallite may actually be franckeite. Teallite is a flexible mineral and may even be somewhat malleable.

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

Formula
PbSnS2 
Crystal System
Orthorhombic 
Crystal Habit
Micaceous 
Cleavage
Perfect, None, None 
Luster
Metallic 
Color
lead gray, grayish black, iron gray 
Streak
black 
Class
Orthorhombic - Dipyramidal 
Fracture
Elastic 
Hardness
1.5-2 
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Teallite from Carguaicollo mine, Quijarro, Potosí, Bolivia

Teallite
            from Carguaicollo mine, Quijarro, Potosí, Bolivia Solid piece composed of sheet-like, foliated crystals of Teallite to over 1cm embedded in matrix from the Type Locality.
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