Formula: Mo(Se,S)2
Origin of name: For A.R. Drysdall, Zambia, Director Geological Survey of Zambia
Crystal system: Hexagonal
Crystal class: 6/m 2/m 2/m
Twinning:
Unit cell: a = 3.287 Å, c = 12.925 Å
Colour: Grayish black with a brownish tint
Diaphaneity: Opaque
Luster: Metallic
Habit: Granular massive, steep pyramidal crystals to 0.5 mm in other minerals
Hardness: 2
Specific gravity: 6.25
Cleavage: 1; {0001} perfect
Tenacity: Pliable, difficult to pulverise
Streak: Brownish black
Synonyms/varieties:
Comments: Found in the oxidation zone of a uranium deposit in a talc schist in assocation with uraninite, apatite, masuyite and secondary uranium minerals
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