Formula: (K,Na)5(Ba,Ca)2Si23Al9O64 . 23H2O
Origin of name: For S. Merlino (1938-), Italian crystallographer, University of Pisa, Italy
Crystal system: Orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell: a = 14.116, b = 14.229, c = 9.946
Colour: White, colourless
Diaphaneity: Transparent to translucent
Luster: Vitreous
Habit: Spheroidal aggregates, to 1 mm, radial, fibrous
Hardness: 4.5
Specific gravity: 2.14-2.27
Cleavage: None
Tenacity:
Streak: White
Synonyms/varieties:
Comments:
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