Formula: Pb2(UO2)(PO4)2.2H2O
Origin of name: for A. Parsons, Canadian mineralogist
Crystal system: triclinic
Crystal class: -1
Twinning:
Unit cell: a = 6.89 Å, b = 10.43 Å, c = 6.68 Å, a = 101.4°, b = 98.3°, g = 86.3°
Colour: pale yellow to yellowish amber, greenish brown
Diaphaneity:
Luster: subadamantine to greasy
Habit: crystals prismatic, to 4 mm or acicular, subhedral, in radial clusters or tufts, massive, radial fibrous, earthy crusts
Hardness: 2.5 to 3
Specific gravity: 5.72
Cleavage: 1; {010} indistinct
Tenacity: conchoidal
Streak:
Synonyms/varieties:
Comments:
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