Formula: (Co,Mg)(UO2)2Si2O7.6H2O
Origin of name: from French oursin = sea urchin
Crystal system: orthorhombic
Crystal class: mm2
Twinning:
Unit cell:
Colour: pale yellow
Diaphaneity:
Luster:
Habit: crystals acicular, 1 mm, in radial aggregates
Hardness:
Specific gravity: 3.674
Cleavage: 1; parallel to elongation
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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