Seen here is a 773 gram polished Chinga meteorite. The quarter-cut specimen was found in Turvinskaya, Russia and has been cut and polished on two sides. The rest of the meteorite retains its natural light brown crust, creating a dramatic contrast. This particular specimen, which was offered by Arizona Skies Meteorites has been sold, but more of this meteorite can be found online.
Boulder Opal This dark opal is found in Western Queensland and it forms naturally on its host rock of ironstone, which is cut to form part of the gemstone. Boulder Opal occurs as thin veins in sedimentary ironstone boulders. The colour layer is naturally part of the dense brown ironstone base and is inseparable from it. by Hypnoeyes