Tachhydrite
Tachhydrite Tach*hy"drite, n. [Gr. tachy`s quick + "y`dwr water. So named from its ready deliquescence.] (Min.) A hydrous chloride of calcium and magnesium occurring in yellowish masses which rapidly deliquesce upon exposure. It is found in the salt mines at Stassfurt. [1913 Webster]

The Collaborative International Dictionary of English. 2000.

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