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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 variou...

Agate Basics


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.

Agate Gemstone Information - GemSelect


May 30, 2013 ... Agate belongs to the quartz (silicon dioxide) family of minerals. Quartz is the second most abundant mineral found on earth's continental crust, ...

Agate: The gemstone agate information and pictures


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  ...

Agate Meanings and Uses | Crystal Vaults


Items 1 - 12 of 216 ... Called the earth rainbow, the concentric bands of Agate form in nearly ... Laguna Agate is found in an area covering roughly four square miles ...

How Do Agates Form? | Penn State University


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 - Gemstone Education


For instance, the bands on many Agate stones wrap around the stone like a tree's rings in ... Agate is found all around the world including the United States.

Next Lecture: Where do gems form and where are they found?


Formation from water near the Earth's surface ... minerals: amethyst (quartz); agate ; and the formation of opal.

Fairburn Agate - Northern State University


EARTH ... About 20 of these 70 gems are commonly found. ... The Fairburn agate was designated as South Dakota's state gemstone on February 11, 1966.

Agates: Treasures of the Earth: Roger Pabian, Brian Jackson, Peter ...


The book features an easy-to-use identification guide and a worldwide listing of where agates are found. More than 200 color photographs of superb agate ...

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Important Agate Mines In The World - jewelinfo4u


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.

Agate - DesertUSA


Agate is a common semiprecious silica mineral that has long been used as a gem and ornamental. ... Agate is found throughout the world. ... It is generally accepted that the Park contains the most colorful examples of silicified logs in the world.

Lake Superior agate - Digging into MN Minerals: Minnesota DNR


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 ...