Formula: Na6(Ca,Mn,Fe)ZrSi6O18
Origin of name: from composition
Crystal system: hexagonal
Crystal class: 3 2/m
Twinning:
Unit cell: = 10.29 Å, c = 13.11 Å
Colour: Colourless to pale yellowish gray
Diaphaneity: Transparent
Luster: Vitreous
Habit: Rounded to irregular deposits, to 1.5 cm
Hardness: 5.5
Specific gravity: 2.90
Cleavage: None
Tenacity: Conchoidal/uneven fracture
Streak: White
Synonyms/varieties:
Comments:
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