Formula: K3Na7Mg2(SO4)6(NO3)2 . 6H2O
Origin of name: For J. Humberstone, Chilean chemist
Crystal system: Hexagonal
Crystal class: -3
Twinning:
Unit cell:
Colour: Colourless
Diaphaneity: Transparent
Luster: Vitreous
Habit: Crystals, thin, hexagonal, microscopic, in aggregates
Hardness: ~ 2.5
Specific gravity: 2.25
Cleavage: 1; {0001}perfect
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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