Formula: (Na,Ca)6(Ca,Na)3Si16O38(F,OH)2·3H2O
Origin of name: Named after André Edmond Lalonde (1955-), Professor in Mineralogy, University of Ottawa, Canada in recognition for his research on micas and the petrology of alkaline intrusives
Crystal system: Triclinic
Crystal class: 1
Twinning:
Unit cell: a = 9.613, b = 12.115, c = 9.589 Å, α = 92.95, β = 119.81, γ = 96.62º
Colour: Colourless to white
Diaphaneity: Transparent
Luster: Vitreous-Pearly
Habit: Thin rounded, micaceous subhedral plates up to 3 mm
Hardness: 2
Specific gravity:
Cleavage:
Tenacity:
Streak:
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