Formula: (Ca,Na2,K2)Al2Si10O24 . 7H2O
Origin of name: After locality; Morden, King's County, Nova Scotia, Canada
Crystal system: Orthorhombic
Crystal class: mm2
Twinning:
Unit cell: a = 18.16 Å, b = 20.45 Å, c = 7.54 Å
Colour: Colourless, white, stained yellowish or pinkish
Diaphaneity:
Luster: Vitreous to silky
Habit: Crystals prismatic, minute, vertically striated; acicular to fine fibrous forming cottony aggregates; compact, porcelaneous
Hardness: 4 to 5
Specific gravity: 2.12 to 2.15
Cleavage: 2; {100} perfect, {010} distinct
Tenacity: Brittle
Streak:
Synonyms/varieties: Ashtonite (Sr-rich var.), pseudonatrolite, ptilolite
Comments:
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