Formula: (K,Na)AlSiO4
Origin of name: for Achille Panunzi, Italian chemist
Crystal system: hexagonal
Crystal class: 6
Twinning:
Unit cell:
Colour: colourless
Diaphaneity: transparent
Luster: vitreous
Habit: short hexagonal prisms to 4 mm long
Hardness: 5.5
Specific gravity: 2.59
Cleavage: 2; {10-10}and {0001} poor
Tenacity:
Streak: white
Synonyms/varieties:
Comments: polymorphous with kaliphilite, kalsilite and trikalsilite
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