Formula: (Pb,Ca,U)2Ta2O6(OH)
Origin of name: from Latin plumbum = lead and microlite
Crystal system: cubic
Crystal class: 4/m -3 2/m
Twinning:
Unit cell:
Colour: greenish yellow to orange
Diaphaneity: translucent
Luster: greasy
Habit: crystals octahedral, rare, crystalline masses
Hardness: 5
Specific gravity: 6.6
Cleavage: none
Tenacity:
Streak:
Synonyms/varieties:
Comments: Pb analogue of microlite
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