Formula: Mg(UO2)2(PO4)2.10H2O
Origin of name: for Achille Salée, Belgian geologist
Crystal system: monoclinic
Crystal class: 2/m
Twinning:
Unit cell: a = 6.98 Å, b = 19.95 Å, c = 9.90 Å, b = 135.2°
Colour: yellow, yellowish green
Diaphaneity: opaque upon dehydration
Luster:
Habit: crystals rectangular plates, to 3 mm, fan-shaped groups
Hardness: 2 to 5
Specific gravity: 3.27
Cleavage: 3; {001} perfect, {010} and {110} indistinct
Tenacity:
Streak:
Synonyms/varieties:
Comments: fluoresces brilliant yellow-green, loses luster and becomes opaque on dehydration
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