Datolite, Centennial Mine No. 1/2, Lake Superior Copper District, Houghton County, Michigan, ex. Jim Bailey Collection #332, Miniature 5.5 cm x 8.5 cm, $250. Online July 15
Cut and polished datolite slab with intense green and blue coloration against a white background. This is the richest colored datolite I have seen from the Centennial Mine.