color photo of agate sample

Hardness: 7

Agate is a many-colored, banded form of chalcedony (a variety of quartz) that has been deposited in cavities or in veins. Beautiful agates that were transported by glaciers during the Ice Age are found in the Glaciated Region in Kansas.

small drawing of Kansas map with Jefferson County highlighted in red

The sample pictured above is from Jefferson County, Kansas


Buchanan, Rex C., Tolsted, Laura L., and Swineford, Ada, 1986, Kansas Rocks and Minerals: Kansas Geological Survey, Educational Series 2, 60 p.

Klein, Cornelis, 1993, Manual of Mineralogy (after James D. Dana), 21st Edition: New York, Wiley, 681 p.

Unless noted otherwise, illustrations by Jennifer Sims, Kansas Geological Survey; photographs by John Charlton, Kansas Geological Survey; text by Liz Brosius, Kansas Geological Survey.

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