Formula: Cu4(UO2)(SeO3)2(OH)6
Origin of name: For Joseph Derriks, student of the Shinklobowe deposits
Crystal system: Orthorhombic
Crystal class: mm2
Twinning:
Unit cell: a = 5.57 Å, b = 19.07 Å, c = 5.96 Å
Colour: Green to bottle green
Diaphaneity:
Luster:
Habit: Crystals euhedral, flattened, small
Hardness:
Specific gravity: 4.72
Cleavage: 1; {010} good
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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