Formula: Hg2OCl
Origin of name: after locality Terlingua, Brewster County, Texas, USA
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell: a = 12.01, b = 5.91, c = 9.49, β = 106°
Colour: Yellow to greenish yellow, brown, yellow material becomes olive-green on exposure to light
Diaphaneity: Transparent to translucent
Luster: Brilliant adamantine
Habit: crystals prismatic, may be flattened, aggregates of distorted crystals, fine powder, striated
Hardness: 2.5
Specific gravity: 9.35
Cleavage: 1; {-101} perfect
Tenacity: Brittle
Streak: Light yellow
Synonyms/varieties:
Comments:
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