Formula: KCa2AlSi7O17(OH)2 . 6H2O
Origin of name: From Greek hydor - water and delhayelite
Crystal system: Orthorhombic
Crystal class: mm2
Twinning:
Unit cell: a = 6.648, b = 23.846, c = 7.073
Colour: Grayish white
Diaphaneity:
Luster: Vitreous
Habit:
Hardness: 4
Specific gravity: 2.17
Cleavage: 3; {010} perfect, {100} and {001} imperfect
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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