Agate is formed in cocentric layers that lends itself to a multi-colored striped appearance. This ensures that no two agates are quite the same. It is often used in cameos and other fashion jewelry. Agate also is what forms the basis of petrified wood.
Multi-colored in cocentric layers
Micro-crystalline quartz (chalcedony). Mohs' hardness rating of 6.5 - 7.0.





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