Vivianite is an iron phosphate mineral that was found in Cornwall, U.K. Named after the late John Henry Vivian, who had discovered it in 1817. Vivianite has been seen in stone and crystal form, and has been noted to be a variety of colors such as blue, green, and sometimes even colorless. The finest crystal specimens have come out of mines in Bolivia, but have been known to be in Brazil, Mexico, and the U.S.A.  A mineral found in bladed crystals and clusters of an intense blue to green color.