Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Tachyhydrite is an unstable mineral, a hydrous chloride of calcium and magnesium with formula: CaMg2Cl6·12H2O. It is a rare component of marine evaporite salt deposits. Upon exposure to moist air it rapidly deliquesces and dissolves. It forms a colorless to yellow trigonal crystal with a vitreous luster. It is soft with a Mohs hardness of 2 and has a low specific gravity of 1.66. It has good cleavage in three directions and typically occurs in crystalline masses. It was first described in 1856 for an occurrence in Stassfurt, Saxony, Germany. Its name is from the Greek for quick water, in reference to its ready deliquescence.

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