Formula: PbSnS2
Origin of name: for Jethro Justinian Harris Teall (1849-1924), Director of the Geological Survey of Great Britain and Ireland.
Crystal system: Orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning: Seen only in polished section
Unit cell: a = 4.266, b = 11.419, c = 4.09
Colour: Lead-gray to iron-gray to grayish black, may tarnish dull or iridescent
Diaphaneity: Opaque
Luster: Metallic
Habit: Crystals tabular, thin, nearly square outline, striated, massive, composed of thin molybdenite-like lamellae
Hardness: 1.5
Specific gravity: 6.36
Cleavage: 1; {001} perfect
Tenacity: Flexible, somewhat malleable
Streak: Black
Synonyms/varieties:
Comments:
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