euchroite

[Gr. eu =well, good; chroia = color, and Eng. suff. -ite ( Min. ).] Min .: A bright green orthorhombic mineral of vitreous luster; its hardne 3.5 to 4; its specific gravity 3:39. Composition: Arsenic acid, 3242 to 34:42; oxide of copper, 46-97 to 48'09; water, 18.80 to 19:31. Found at Libethen, in Hungary. ( Dana .) eu-chrōne, s. [Gr. euchroos=well colored: eu well, and chros =color.] Chem.: A dark-blue insoluble substance formed when zinc is added to an aqueous solution of euchroic-acid.