polyhalite
/ˌpɒlɪˈhalʌɪt/ /ˌpɒlɪˈheɪlʌɪt/Mineralogy
noun
A mineral of the triclinic crystal system consisting of a hydrated sulphate of potassium, calcium, and magnesium, K2Ca2Mg(SO4)4, and usually occurring as pink or red fibrous masses.
Origin
Early 19th century; earliest use found in Quarterly Journal Scottish. From German Polyhalit from poly- + ancient Greek ἅλς salt + German -it.