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.
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.
Formation from water near the Earth's surface ... minerals: amethyst (quartz); agate ; and the formation of opal.
Agate is essentially quartz, and its physical properties are... ... Agate is found throughout the world. .... Planet Earth section illustration on white background.
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 a banded form of finely-grained, microcrystalline Quartz. ... Agates and Jasper were historically found in the Idar-Oberstein region, and cut and polished ...
May 30, 2013 ... Agate belongs to the quartz (silicon dioxide) family of minerals. The quartz group is the second most abundant mineral found on earth's ...
Items 1 - 12 of 221 ... Called the earth rainbow, the concentric bands of Agate form in nearly ... Laguna Agate is found in an area covering roughly four square miles ...
This catastrophic event, spurred by molten rock moving deep within the earth, ... The Lake Superior agate differs from other agates found around the world in its ...