Formula: K2Ca5(SO4)6 . H2O
Origin of name: For R. Görgey, Austrian petrographer
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell: a = 17.48 Ǻ, b = 6.83 Ǻ, c = 18.23 Ǻ, β = 113.3°
Colour: Colourless to yellowish
Diaphaneity:
Luster: Vitreous
Habit: Crystals thin tabular
Hardness: ~ 3.5
Specific gravity: 2.95
Cleavage: 1; {100} distinct
Tenacity: Splintery
Streak:
Synonyms/varieties:
Comments:
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