Formula: NaCaCu5(AsO4)4Cl·5H2O
Origin of name: Named for Chester (Chet) S. Lemanski, Jr., a New Jersey, USA collector.
Crystal system: Tetragonal
Crystal class: 4 2 2
Twinning:
Unit cell: a = 10.01, c = 36.691
Colour: Dark blue, sky blue
Diaphaneity: Translucent
Luster: Vitreous
Habit: Masses and aggregates in/on matrix, thin tetragonal plates
Hardness: 2-3
Specific gravity: 3.78
Cleavage: [001] Perfect
Tenacity:
Streak: Sky blue
Synonyms/varieties:
Comments: Easy to confuse with lavendulan. The Ca analogue of zdenekite.
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