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Why are agates igneous?

Answer

They aren't found in igneous matrix only. Agates are formed in gas cavities in volcanic rock, as well as in cracks and holes in metamorphic and sedimentary rocks. Solutions high in silica content filled these cavities to form silica gel which
Q&A Related to "Why are agates igneous?"
Igneous rocks are formed when molten materials in the form of lava above the Earth's surface or magma below the Earth's surface cool and harden. Two common examples of igneous rocks
http://answers.ask.com/Science/Nature/how_igneous_...
1. Purchase or borrow a book on agates from a bookstore or library. If you know collectors, maybe they will lend you books and pamphlets for identifying agates. The rough forms can
http://www.ehow.com/how_8208864_agate-rocks.html
1. Distinguish igneous rock from sedimentary rock by noting that igneous rocks lack fossils, shells and rounded grains. All igneous rocks have interlocking crystals. In some igneous
http://www.wikihow.com/Identify-Igneous-Rocks
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Igneous is something that is produced under intense heat such as igneous rock which is a rock formed from solidifying from a molten state. ...
An igneous rock is one that forms when molten minerals cool to form a solid. It is among the three main types of rock, the others being metamorphic and sedimentary ...
Agate is a fine-grained variety of chalcedony gemstone that is stripped by nature. Each agate forms by filing of a hollow space in a host rock, and it has concentric ...
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