Formula: Pb2(CO3)Cl2
Origin of name: from gas phosgene, which contains some of the same elements
Crystal system: tetragonal
Crystal class: 4/m 2/m 2/m
Twinning:
Unit cell: a = 8.111 Å, c = 8.824 Å
Colour: colourless, white, yellowish white, gray, brown, greenish
Diaphaneity:
Luster: adamantine
Habit: crystals short to long prismatic or thick tabular, massive, granular
Hardness: 2 to 3
Specific gravity: 6.133
Cleavage: 3; {001} and {110} distinct, {100} indistinct
Tenacity: conchoidal
Streak: white
Synonyms/varieties: galenoceratite
Comments: fluoresces sometimes
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