Formula: Na3(SO4)(NO3) . H2O
Origin of name: For L. Darapsky, Chilean mineralogist
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: Colourless
Diaphaneity: Transparent to translucent
Luster: Vitreous
Habit: Crystals long prismatic or thin tabular, elongated; granular or platy
Hardness: ~ 2.5
Specific gravity: 2.20
Cleavage: 2; {100} perfect, {010} good
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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