Formula: (Y,Gd,Dy,Ho,Er,Nd,Sm,Ca)4Cu(CO3)4Cl(OH)5·2(H2O)
Origin of name: Named for Robert James Champion de Crespigny (1950-), Chancellor of the University of Adelaide, Australia.
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell: a = 8.899, b = 22.77, c = 8.589, β = 120.06°
Colour: Turquoise to intense royal blue
Diaphaneity: Transparent
Luster: Vitreous
Habit: Efflorescent, globular
Hardness: 4
Specific gravity: 3.64
Cleavage: None
Tenacity:
Streak: Pale blue
Synonyms/varieties:
Comments: Supergene product with other Y-bearing copper minerals
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