How Are Agates Formed?

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Agates form in hollow cavities as a secondary deposit. Even though they can form in all types of host rocks most of the agates we see were formed in ancient volcanic lava.
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How Are Agates Formed?
Agates are semiprecious stones in the chalcedony category of minerals, a type of complicated quartz structure made from different fibrous bands of color that can range from white and gray to green, red, and blue, with a variety of translucent and opaque... More »
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Agates are formed when volcanic rock is formed near water. Silica-rich water is pushed up into the rock through bubbles and when the water evaporates it forms a crystalized gel and then hardens.
Q&A Related to "How Are Agates Formed"
Most agates are formed from volcanic rock and sometimes can be found in metamorphic rock formations. They are formed like nodules from the rock and lava.
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Agates are semiprecious stones in the chalcedony category of minerals, a type of complicated quartz structure made from different fibrous bands of color that can range from white
http://www.ehow.com/how-does_5180993_agates-formed...
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
http://wiki.answers.com/Q/How_does_agate_form
An agate starts with a cavity, a void in the rock. The best are found in basalt, a young
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