Formula: SrNa2Al4Si4O16
Origin of name: from elements in composition
Crystal system: orthorhombic
Crystal class: mm2 or 2/m 2/m 2/m
Twinning:
Unit cell:
Colour: white
Diaphaneity:
Luster: vitreous
Habit: crystals anhedral, in aggregates to 1 mm
Hardness: 6.5
Specific gravity: 2.94
Cleavage: none
Tenacity:
Streak: white
Synonyms/varieties:
Comments: member of the feldspar group
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