Formula: (Na,K,Ca)7-8(Si,Al)12O24(SO4,Cl)1-2
Origin of name: For Giuseppe Guiseppette, Italian mineralogist
Crystal system: Hexagonal
Crystal class: 6mm or -6m2
Twinning:
Unit cell:
Colour: Pale violet-blue
Diaphaneity:
Luster:
Habit: Massive, as anhedral grains
Hardness: 6 to 7
Specific gravity: 2.35
Cleavage: None
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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