Teallite

Teallite is a sulfide mineral of tin and lead with chemical formula: PbSnS2. It occurs in hydrothermal veins and is sometimes mined as an ore of tin. Teallite forms soft silvery grey mica-like plates and crystallizes in the orthorhombic system. The Mohs hardness is 1.5 to 2 and the specific gravity is 6.4.

Teallite
General
CategorySulfide minerals
Formula
(repeating unit)
PbSnS2
Strunz classification2.CD.05
Crystal systemOrthorhombic
Crystal classDipyramidal (mmm)
H-M symbol: (2/m 2/m 2/m)
Space groupPbnm (no. 62)
Unit cella = 4.26 Å, b = 11.41 Å
c = 4.09 Å; Z = 2
Identification
ColorSilvery gray, lead-gray to iron-gray; tarnishes dull or iridescent
Cleavage{001} perfect (lamellar cleavage); flexible
TenacityMalleable
Mohs scale hardness1 12 - 2
LusterMetallic
StreakBlack
DiaphaneityOpaque
Specific gravity6.36
Optical propertiesAnisotropic
PleochroismWeak
References[1][2]

Teallite was first described in 1904 from its type locality in Santa Rosa, Antequera, Bolivia. It was named for the British geologist Jethro Justinian Harris Teall (1849–1924).[3]

See also

References

Media related to Teallite at Wikimedia Commons

This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.