noun Mineralogy.
a decahydrate form of sodium sulfate, Na 2 SO 4 ⋅10H 2 O.
Compare Glauber's salt.

1850–55; < Latin (sal) mīrābil(is) wonderful (salt) + -ite1

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Encyclopedia Britannica


a widespread sulfate mineral, hydrated sodium sulfate (Na2SO410H2O), that forms efflorescences and crusts, particularly in arid regions. It occurs in deposits from salt lakes, springs, and playas, especially in the winter (its solubility decreases markedly at lower temperatures). It is abundant in California, Wyoming, and other areas of the western and southwestern United States; it also occurs in Austria, Spain, abundantly in Bohemia, and in the Garabogazkol Gulf of the Caspian Sea. For detailed physical properties, see sulfate mineral (table)

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Other phases such as mirabilite, sepiolite and highly soluble salts control solution composition under yet more saline conditions.
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