Formula: PbAl3(PO4)2(OH)5.H2O
Origin of name: from Latin plumbum = lead, gummi = gum
Crystal system: hexagonal
Crystal class: 3m
Twinning:
Unit cell: a = 7.01 Å, c = 16.71 Å
Colour: grayish white, yellowish gray to yellowish, reddish
Diaphaneity:
Luster: dull to resinous, gum-like
Habit: crystals prismatic, hexagonal outline, minute, massive, compact, crusts, stalactitic or botryoidal with concentric banding
Hardness: 4.5 to 5
Specific gravity: 4.01
Cleavage: none
Tenacity: brittle
Streak: colourless to white
Synonyms/varieties:
Comments:
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