Formula: PbCu4(OH)6(SO4)2 . 3H2O
Origin of name: After locality; Lautenthal, Harz, Germany
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: Blue
Diaphaneity: Transparent
Luster: Vitreous
Habit: Tabular elongate crystals 0.03 x 0.2 x 0.5 mm, most twinned on (100)
Hardness:
Specific gravity:
Cleavage: 2; {001}and {010} good
Tenacity:
Streak: White
Synonyms/varieties:
Comments: Pb analogue of devilline
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