An opaque variety of cryptocrystalline quartz, jasper is found worldwide. It owes it opacity and color to its incorporation of varying amounts of other minerals. Red to brown jasper is colored by hematite, clay gives it a yellow shade, and goethite can make it brown or yellow. There are many varieties of jasper including picture, brecciated, and snakeskin. Oregon is famous for its wide varieties of picture jasper. Other deposits are found in the USA, Mexico, and Africa. Metaphysically, jasper is sometimes used for healing purposes.