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Formula: Na2Ca(SO4)2
Sulphate
Crystal System: Monoclinic
Specific gravity: 2.75 to 2.85 measured, 2.78 calculated
Hardness: 2½ to 3
Streak: White
Colour: Grey, colourless, yellowish, red
Solubility: Soluble in water
Environments:
Glauberite occurs in dry salt-lake beds or marine evaporite deposits, generally in desert climates,
and in fumeroles. Glauberite dissolves in water, depositing
gypsum, so pseudomorphs of
gypsum after
glauberite are not uncommon
(AJM 10.1.17-18).
At Lake Crosbie, Victoria, Australia, glauberite occurs associated with
halite and gypsum in black mud under a salt
crust which covers the lake
(AJM 10.1.17-18).
Camp Verde, Arizona, USA, is known for calcite
pseudomorphs after
glauberite. Gypsum pseudomorphs
after glauberite are also found here
(R&M 87.1.18, KL p190).
At Fanwood quarry, Union county, New Jersey, USA, prehnite
pseudomorphs
after glauberite have been found
(KL p242).
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