One of the mysteries of the English language finally explained.
A mineral of the cubic crystal system consisting of a hydrated arsenate of iron and potassium (often also containing other elements, especially barium or sodium), and usually occurring as minute greenish or brownish crystals of cubic or tetrahedral form.
Mid 19th century; earliest use found in Charles Shepard (1804–1886). From pharmaco- + siderite, after German Pharmakosiderit.
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