Agate rock. A microcrystalline variety of silica, chiefly chalcedony, characterised by its fineness of grain and brightness of color. Although agates may be found in various kinds of rock, associated with volcanic rocks and can be common in certain metamorphic rocks

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Agate rock. A microcrystalline variety of silica, chiefly chalcedony, characterised by its fineness of grain and brightness of color. Although agates may be found in various kinds of rock, associated with volcanic rocks and can be common in certain metamorphic rocks

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Photo credit: © World History Archive / Alamy / Afripics
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Keywords: agate, agates, archival, archive, brightness, chalcedony, characterised, chiefly, color., common, fineness, geology, grain, historical, history, kinds, metamorphic, microcrystalline, rock, rock., rocks, silica, variety, volcanic