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Agate
Cabochons
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Agate
is a microcrystalline form of quartz or silica, chiefly chalcedony, known
for its fine grain and bright color. Although agates may be
found in various kinds of rock, they are typically associated with volcanic
rocks. Most agates occur as nodules in volcanic rocks or ancient lava.
Formed by cavities in the lava which were filled with silica deposited in
layers. You can see these layers in banded agate.
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