Formula: Pb6Ca4Si6O21Cl2
Origin of name: for F. Nason, American geologist
Crystal system: hexagonal
Crystal class: 6/m
Twinning:
Unit cell: a = 9.994 Å, c = 13.08 Å
Colour: white
Diaphaneity:
Luster: greasy to adamantine
Habit: crystals prismatic, minute, rare, massive, granular
Hardness: 4
Specific gravity: 5.55
Cleavage: 2; basal good, prismatic indistinct
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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