nTachhydrite(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.
Century Dictionary and Cyclopedia
ntachhydriteA massive mineral of yellowish color found in the salt-mines of Stassfurt in Prussia. It is a hydrous chlorid of calcium and magnesium: named in allusion to its rapid deliquescence on exposure to the air and water.
Webster's Revised Unabridged Dictionary
Gr. tachy`s quick + "y`dwr water. So named from its ready deliquescence