Formula: PbU4O13.4H2O
Origin of name: for E. Richet, geologist, Katanga
Crystal system: triclinic
Crystal class: 1 or -1
Twinning:
Unit cell:
Colour: black
Diaphaneity:
Luster: adamantine
Habit: crystals pseudohexagonal tablets, minute, subparallel aggregates
Hardness: 3
Specific gravity:
Cleavage: 2; {001}perfect, {010}less developed
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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