Formula: Ca2(SO4)(CO3).4H2O
Origin of name: after locality Rapid Creek, Yukon, Canada
Crystal system: orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell:
Colour: colourless to white
Diaphaneity: transparent
Luster: vitreous
Habit: crystals acicular, to 2 mm, in radial sprays
Hardness: 2
Specific gravity: 2.21
Cleavage: 2; {010} perfect, {100} good
Tenacity:
Streak: white
Synonyms/varieties:
Comments:
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