Teallite

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Teallite
Teallit - Ichocollo, Bolivien.jpg
Teallite - Ichocollo, Bolivia
General
Category Sulfide minerals
Formula
(repeating unit)
PbSnS2
Strunz classification 2.CD.05
Crystal system Orthorhombic
Dipyramidal class
Unit cell a = 4.26 Å, b = 11.41 Å
c = 4.09 Å; Z = 2
Identification
Color Silvery gray, lead-gray to iron-gray; tarnishes dull or iridescent
Crystal symmetry Orthorhombic
H-M symbol: (2/m 2/m 2/m)
Cleavage {001} perfect (lamellar cleavage); flexible
Tenacity Malleable
Mohs scale hardness 1½ - 2
Luster Metallic
Streak Black
Diaphaneity Opaque
Specific gravity 6.36
Optical properties Anisotropic
Pleochroism Weak
References [1][2]

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 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]

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Media related to Teallite at Wikimedia Commons