Formula: KCaAl3Si3O12.5H2O
Origin of name: for William A. Henderson Jr., American mineral collector, physician of Stamford, Connecticut (USA)
Crystal system: Triclinic
Crystal class: 1
Twinning: Complex, by rotation about [111]; rotation across (001); by rotation about [110] or rotation across (110), as trellis-like twinned aggregates
Unit cell: a = 9.206, b = 9.216, c = 9.5, α = 92.34°, β = 92.7°, γ = 90.12°
Colour: Colourless
Diaphaneity: Transparent
Luster: Vitreous
Habit: crystals tabular, in trellis-like twinned aggregates smaller than 1 mm
Hardness: 3
Specific gravity: 2.18
Cleavage: 3; {100}, {010} and {001} perfect
Tenacity: Brittle
Streak: White
Synonyms/varieties:
Comments: member of zeolite group
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