These malachite pseudomorphs are from the Milpillas Mine in Cuitaca, Mun de Santa Cruz, Sonora, Mexico. Mining at this locale began in 2006 with the extraction of copper minerals. The mining began in several copper oxide zones where the carbonate minerals were found.Thirty-six mineral species have been identified at the mine including malachite. It is a secondary copper carbonate containing the elements Cu, C and O.This specimen is an exceptional, double terminated, malachite pseudomorph of azurite crystals. It is complete and intact on all surfaces and has minor matrix attached. It consists of a primary crystal that hosts three smaller double terminated crystals.The crystals have a velvet like (fibrous) and chatoyant appearance. This piece measures 1 7/16 x 1 x 1 inches or 3.7 x 2.5 x 2.5 cm.