Formula: Ca3Mg3(UO2)2(CO3)6(OH)4.18H2O
Origin of name: for John Rabbitt, American geochemist
Crystal system: monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: greenish yellow, pale green
Diaphaneity:
Luster: silky
Habit: crystals fine acicular, elongated on c-axis
Hardness: about 2.5
Specific gravity: 2.57
Cleavage: 3, two prismatic, perfect, {001} good
Tenacity:
Streak:
Synonyms/varieties:
Comments: fluoresces cream yellow in SW ultraviolet light
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