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Peridot (/ ˈ p ɛ r ɪ ˌ d ɒ t,-ˌ d oʊ / PERR-ih-dot, -doh), sometimes called chrysolite, is a yellow-green transparent variety of olivine. Peridot is one of the few gemstones that occur in only one color. Peridot can be found in mafic and ultramafic rocks occurring in lava and peridotite xenoliths of the mantle.
Peridotite is named for the gemstone peridot, a glassy green gem originally mined on St. John's Island in the Red Sea [65] and now mined on the San Carlos Apache Indian Reservation in Arizona. [ 66 ] Peridotite that has been hydrated at low temperatures is the protolith for serpentinite , which may include chrysotile asbestos (a form of ...
Olivine has many uses, such as the gemstone peridot (or chrysolite), as well as industrial applications like metalworking processes. Olivine in cross-polarized light. The ratio of magnesium to iron varies between the two endmembers of the solid solution series: forsterite (Mg-endmember: Mg 2 Si O 4) and fayalite (Fe-endmember: Fe 2 Si O 4).
Demantoid is the green gemstone variety of the mineral andradite, a member of the garnet group of minerals. Andradite is a calcium- and iron-rich garnet. The chemical formula is Ca 3 Fe 2 (SiO 4) 3 with chromium substitution as the cause of the demantoid green color. Ferric iron is the cause of the yellow in the stone.
Gems of the Galaxy Zoos (Zoogems) was a gap-filler project which used the Hubble Space Telescope to take images of unusual objects found by volunteers classifying data from both Galaxy Zoo (GZ) and Radio Galaxy Zoo (RGZ).
In the 1980s, the Lyons Groups of Galaxies listed 485 galaxy groups with 3,933 member galaxies. Galaxy Zoo is a project aiming at a more comprehensive list: launched in July 2007, it has classified over one million galaxy images from The Sloan Digital Sky Survey, The Hubble Space Telescope and the Cosmic Assembly Near-Infrared Deep ...
2 pieces of Gem lettuce. 3 sweet pickles, sliced. 1 red onion, sliced. 1 1/2 oz special sauce, (usually a combination of mayo, ketchup, pickle relish, Dijon mustard, a little sugar and white vinegar)
UGC 7907, [2] PGC 42863, [2] Hockey Stick Galaxies, Crowbar Galaxy NGC 4656/57 is a highly warped edge-on [ 3 ] barred spiral galaxy located in the local universe 30 million light years away from Earth in the constellation Canes Venatici . [ 4 ]