Formula: Pb4Cu(SO4)(OH)8
Origin of name: For John Ely, American mining promoter
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: Violet
Diaphaneity: Transparent
Luster: Silky
Habit: Crystals prismatic to fibrous, in radiating tufts and sprays
Hardness: 2
Specific gravity: ~ 6
Cleavage: 1; {001} good
Tenacity:
Streak: Pale violet to white
Synonyms/varieties:
Comments:
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