Formula: Pb2Cu5(UO2)2(SeO3)6(OH)6 . 2H2O
Origin of name: For M. Demesmaeker, geologist, Zaire
Crystal system: Triclinic
Crystal class: -1
Twinning:
Unit cell: a = 11.94 Å, b = 10.02 Å, c = 5.62 Å, α = 90°, β = 100°, γ = 91.9°
Colour: Bottle green, turns brownish when dehydrated
Diaphaneity:
Luster:
Habit: Crystals elongated
Hardness: 3 to 4
Specific gravity: 5.28
Cleavage:
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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