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 specimen consists of mound-like formations of mixed layers of pink and green smithsonite. The translucency of the layers gives the piece a greenish color with a purple hue depending on the way the piece is viewed. This piece measures 3 1/8 x 2 1/8 x 1 3/16 inches or 78 x 53 x 31 mm.