Formula: BaCa4Si16O36(OH)2 . 10H2O
Origin of name: For G. Macdonald, American vulcanologist
Crystal system: Orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell:
Colour: White to colourless
Diaphaneity:
Luster: Vitreous to satiny
Habit: Crystals acicular, tiny, elongated parallel to a-axis
Hardness: 3.5 to 4
Specific gravity: 2.27
Cleavage: 3; {010} perfect, {001} good, {100} poor (or a fracture)
Tenacity:
Streak: White
Synonyms/varieties:
Comments:
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