Formula: Cu(UO2)(OH)4
Origin of name: for Pierre van den Brande (1896-1957), Belgian geologist who discovered the ore deposit at Kalongwe, Zaire.
Crystal system: Triclinic
Crystal class: 1
Twinning:
Unit cell: a = 7.86 Å, b = 5.44 Å, c = 6.10 Å, a = 91.9°, b = 102°, g = 89.6°
Colour: Dark green to blackish green
Diaphaneity: Translucent to transparent in thin flakes
Luster: Vitreous
Habit: Crystals tabular, small, lamellar masses, radial fibrous rosettes, massive, scaly
Hardness: 4
Specific gravity: 5.08
Cleavage: 1; {110} perfect, two others in the [001] zone indistinct
Tenacity:
Streak: Green
Synonyms/varieties:
Comments: Radioactive
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