This specimen is from the Refugio Mine in Choix, Mun.de Choix, Sinaloa, Mexico. This mine is famous for the smithsonite specimens recovered and offered on the market by Benny Fenn. Smithsonite is a carbonate mineral containing the elements Zn, C, and O. It is found in the oxidation zones of zinc ore deposits. This locale produced ( no longer in operation ) a wide variety of colors and multiple color combinations of the mineral. This piece is lavender to purple. It has an excellent form and a vitreous luster. It measures 2 5/8 x 2 5/8 x 1 1/8 inches or 67 x 67 x 28 mm.