A hexagonal hydrated basic arsenate of copper and bismuth, usually occurring as green fibrous encrustations.
Origin
Late 19th century; earliest use found in The Manufacturer and Builder. From German Mixit from the name of A. Mixa, 19th-cent. Czech inspector of mines at Joachimsthal, Bohemia (now Jáchymov and part of the Czech Republic), where the mineral occurs + -it.