This calcite comes from Chihuahua, Mexico. Calcite is a carbonate (Ca, C) that comes in a variety of natural colors that are caused by trace impurities in the crystal matrix. Mexico produces some of the best and most colorful varieties known. This particular vivid orange calcite is natural undyed and unenhanced. It is a massive calcite with a solid structure and great translucency. It has a smooth finish and vitreous luster. These photos were illuminated from the top and back to show off the saturated and translucent color. This piece measures 4 1/4 x 3 3/16 x 1 5/16 inches or 109 x 83 x 33 mm. It weighs just under 1 pound.