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n.1.(Min.) A mineral occurring in transparent emerald green crystals. It is hydrous arseniate of copper.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
Although at first predominantly if not exclusively British minerals, Wright's exchange boxes soon began to include obvious foreign material (foreign to England that is!): in 1849 he sent such things as yttrotantalite (then only known from Sweden) and euchroite (only known from Libethen, Hungary), and in 1852 Wright asked Jefferis if he wanted Norwegian material: "I have purchased 40 boxes." The two men exchanged specimens for several years, sometimes sending nearly 200 at a time, but the flow of minerals seems to have faltered towards the end of the 1850s.
755 [many good ones] Euchroite, Libethen, Hungary, no.