Formula: PbCu(VO4)(OH)
Origin of name: From locality; Mottram, St. Andrew, Cheshire, England
Crystal system: Orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell: a = 7.6822 Ǻ, b = 9.278 Ǻ, c = 6.034 Ǻ
Colour: Grass-green to dark green, brown to nearly black
Diaphaneity:
Luster: Vitreous to greasy
Habit: Crystals pyramidal, prismatic or tabular, faces rough or uneven; plumose aggregates; drusy crusts; stalactitic; botryoidal
Hardness: 3 to 3.5
Specific gravity: ~ 5.9
Cleavage: None
Tenacity: Conchoidal to uneven; brittle
Streak:
Synonyms/varieties:
Comments: Series with descloizite
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