Formula: UFe(Nb,Ta)2O8
Origin of name: for E. Petsch
Crystal system: hexagonal
Crystal class: -3 2/m
Twinning:
Unit cell:
Colour: black
Diaphaneity: opaque
Luster: metallic
Habit: crystals to 4 cm
Hardness: 5
Specific gravity: 5.5
Cleavage: none
Tenacity:
Streak: brown-black
Synonyms/varieties:
Comments: metamict
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