A: It is agate not a composite, this is a definition of Agate:
Agate is a cryptocrystalline variety of silica, chiefly chalcedony, characterized by its fineness of grain and brightness of color. Although agates may be found in various kinds of rock, they are classically associated with volcanic rocks and can be common in certain metamorphic rocks.
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Answer provided by: Karla Schafer (10/15/2014)