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Agate, is a distinctly banded variety ofChalcedony, is a variety of Quartzgemstones composed of layers of quartz, sometimes of different colors. When it is concentrically banded (often in rather wild patterns) it is called by the subvaritey name "agate." When it is in flat layers/bands it is called by the subvariety name "onyx." Agate usually occurs as rounded nodules or veins in rock such as volcanic lava. The layers of quartz are often concentric. The composition of agate varies greatly, but silica is always predominant, usually with alumina and oxide of iron. Agate comes in most colors. There are several types of agate. Common ones are: blue lace agate, moss agate, tree agate and petrified wood.
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