Formula: Na3Al16(SO4)2(PO4)10(OH)17.20H2O
Origin of name: for Vincent Peisley (1941-), Australian discoverer of mineral
Crystal system: monoclinic
Crystal class: unknown
Twinning:
Unit cell: a = 13.31, b = 12.62, c = 23.14, β = 110°
Colour: white
Diaphaneity:
Luster: Earthy, dull
Habit: massive, chalky
Hardness: 3
Specific gravity: 2.11
Cleavage: none
Tenacity:
Streak: White
Synonyms/varieties:
Comments:
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