This is deep electric blue azurite crystals on limonite matrix. There are some small areas of malachite as well. This piece is from the Concepcion del Oro, Zacatecas, Mexico. This piece measures overall 10 cm wide by 8.7 tall cm and is 6.8 cm front to back. Some of the crystals are chipped. The bottom of the piece have been cut so it will display better.