Formula: Na2Ca(CO3)2 . 5H2O
Origin of name: For J. Gay-Lussac, French chemist
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell: a = 11.58 Ǻ, b = 7.78 Ǻ, c = 11.21 Ǻ, β = 102.0°
Colour: Colourless, white, grayish, yellowish
Diaphaneity: Transparent
Luster: Vitreous
Habit: Crystals flattened, wedge-shaped, elongated
Hardness: 2.5 to 3
Specific gravity: 1.99
Cleavage: None
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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