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Agate /ˈæɡət/ is a cryptocrystalline variety of silica, chiefly chalcedony, characterised by its fineness of grain and brightness of color. Although agates may be found in various kinds of rock, they are classically ... "skin" of the agate, is generally a dark greenish mineral substance, like celadonite, delessite or "green earth", ...


There are thousands of named agates found in nearly all countries of the world. ... Rift zones are cracks in the Earth's surface out of which molten lava flowed.


Sep 1, 2001 ... He glances toward the array of cut and polished agates lining the ... "The hot water pumped from deep within the earth contains a lot of dissolved silica," he explains. ... The best are found in basalt, a young volcanic rock.


Agate is found throughout the world. In the United States it is produced in several western states; Oregon, Washington, Idaho, and Montana are the chief sources ...


Mar 9, 2016 ... Agate mines are found almost everywhere in the world. But some of the more important mines are found in USA, Russia, Europe and Canada.


About 20 of these 70 gems are commonly found. All gemstones .... Can either be formed beneath the earth's surface (plutonic), or by volcanic activity. Inorganic ...


Items 1 - 12 of 296 ... Called the earth rainbow, the concentric bands of Agate form in nearly ... Laguna Agate is found in an area covering roughly four square miles ...


Sep 23, 2016 ... Dwarves Earth Treasures: Fairburn Agates, Black HIlls, South Dakota. ... Gemstones Found in India | Here's a picture of the backside of Randy's ...


Apr 9, 2009 ... Earth Art: Highly magnified images of rocks and minerals from the world's largest ... clear six-sided prism and is commonly found in veins in rocks formed by hot water and in ... Mineral images: Rock formation art: Banded agate ...