Crystals are may be striated . The most common color is light blue, and is thought to be caused by irradiation of gold. This light blue tint may be present in a whole specimen, or may only be confined to one area. Celestine is isomorphous with Barite , and may partially replace it. Uses Celestine is the most common mineral containing the element strontium, and is its primary ore .
Fine specimens are in high demand by collectors.
Blue and white crystals are found associated with bright yellow Sulfur crystals in the famous Sicilian sulfur mines of Cattolico and Agrigento, Italy. In Canada, an orange Celestine has been reported near Toronto at Orangeville. In Mexico, Celestine is found in Niaca, Chihuahua, and Matehuala, San Luis Potosi. The first U.S. occurrence in Lockport, Niagara Co., New York, was discovered while digging the Erie Canal. The state of Ohio contains perhaps the greatest deposits, particularly South Bass Island in Lake Erie, where giant pale blue crystals were obtained.