| 21. | Agate Fossil Beds is maintained by the National Park Service.
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| 22. | The supporting columns are made from agate-coloured marble.
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| 23. | In Japan, percussion firemaking was performed, using agate or quartz.
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| 24. | The cameo cup of Hellenistic Egypt in four-layered sardonyx agate.
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| 25. | The lava flows formed the conditions for creation of Lake Superior agates.
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| 26. | The glacier picked up surface agates and transported them south.
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| 27. | It occurs outside California in the Agate Desert of Oregon.
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| 28. | Although it is unincorporated, Agate has the ZIP code of 58310.
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| 29. | The banded agate is used for the manufacture of cameos.
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| 30. | This rock was originally incorrectly called " Turritella agate ".
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