Formula: PbFCl
Origin of name: Locality, Matlock, Derbyshire, England
Crystal system: Tetragonal
Crystal class: 4/m 2/m 2/m
Twinning:
Unit cell: a = 4.110 Å, b = 7.233 Å
Colour: Colourless, yellow, pale yellowish brown, greenish
Diaphaneity:
Luster: Adamantine
Habit: Crystals tabular or stout pyramidal; rosettes or aggregates of platy crystals; massive, lamellar
Hardness: 2.5 to 3
Specific gravity: 7.12
Cleavage: 1; {001} perfect
Tenacity: Subconchoidal to uneven; brittle
Streak:
Synonyms/varieties:
Comments:
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