Formula: PbCO3
Origin of name: From Greek for lead carbonate
Crystal system: Orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning: Common on {110}, lamellar, reticulated, cyclic (sixlings); less common on {130}, contact, heart-shaped
Unit cell: a = 5.183 Ǻ, b = 8.503 Ǻ, c = 6.144 Ǻ
Colour: Colourless, white, gray, smoky, blue, green, black
Diaphaneity:
Luster: Adamantine, vitreous, resinous
Habit: Crystals tabular, elongated along a-axis, or equant, acicular or thin tabular; twinned; granular, massive, jackstraw
Hardness: 3 to 3.5
Specific gravity: 6.55
Cleavage: 4; {110} and {021} distinct, {010} and {012} trace
Tenacity: 6.55
Streak: Colourless to white
Synonyms/varieties:
Comments: Sometimes fluoresces yellowish in LW
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