Formula: Pb3(Zn,Cu)3(TeO6)(As O4)(OH)3
Origin of name: For Marjorie Duggan, analytical chemist
Crystal system: Hexagonal
Crystal class: 6/m 2/m 2/m
Twinning:
Unit cell: a = 8.472 Å, c = 5.208 Å
Colour: Colourless to green
Diaphaneity:
Luster: Adamantine
Habit: Crystals stubby prismatic, slightly curved, tiny
Hardness: 3
Specific gravity: 6.33
Cleavage: 1; {11-20} poor
Tenacity: Exceedingly brittle
Streak:
Synonyms/varieties:
Comments: Green colour from inclusions and increasing copper content
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