Formula: (Na,K)10Ca5Al6Si32O80(Cl2,F2,SO4)3 . 18H2O
Origin of name: Named for Fernard Delhaye (1880-1946), Belgian geologist, a pioneer in the geological exploration of the northern Kivu region of Zaire.
Crystal system: Orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell: a = 13.06, b = 24.65, c = 7.04
Colour: Colourless, light gray-green
Diaphaneity: Transparent
Luster:
Habit: Crystals platy
Hardness: 4.5
Specific gravity: 2.60
Cleavage: 1; {010} distinct
Tenacity:
Streak: White
Synonyms/varieties:
Comments:
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