Formula: Na2Ca(SO4)2
Origin of name: For J. Glauber, German chemist
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell: a = 10.13 Ǻ, b = 8.30 Ǻ, c = 8.53 Ǻ, β = 112.2°
Colour: Colourless, grey, yellowish
Diaphaneity:
Luster: Vitreous, pearly on basal cleavage
Habit: Crystals tabular, sharp bevelled edges, prismatic or dipyramidal
Hardness: 2.5 to 3
Specific gravity: 2.80
Cleavage: 2; {001} perfect, {110} distinct
Tenacity: Conchoidal; brittle
Streak: White
Synonyms/varieties:
Comments:
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