One of the mysteries of the English language finally explained.
A rare blue to greenish-blue mineral, occurring in encrustations and prismatic crystals, which is a hydrated basic copper sulphate, Cu₄(SO₄)(OH)₆·H₂O, closely similar to langite and crystallizing in the monoclinic system.
1960s; earliest use found in Mineralogical Abstracts. From the name of Eugene Waldemar Posnjak, U.S. geochemist + -ite, after Russian poznjakit.
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