Formula: Ca3U(UO2)6(CO3)2(OH)18.3-5H2O
Origin of name: for Jean Wyart (1902-1992), Professor of mineralogy at Sorbonne, Paris, France
Crystal system: Orthorhombic
Crystal class: 222
Twinning:
Unit cell: a = 11.25 Å, b = 7.10 Å, c = 20.80 Å
Colour: Violet-black to black, alters to greenish
Diaphaneity: Translucent to opaque
Luster: Dull, vitreous to submetallic on cleavages
Habit: crystals striated, small, platy
Hardness: 3 to 4
Specific gravity: 4.69
Cleavage: 2; {001} perfect, {010}
Tenacity:
Streak: Brownish violet
Synonyms/varieties:
Comments: Radioactive
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