All about agates

From: Telegraph - Herald (Dubuque) | Date: September 29, 2002| Author: MARY NEVANS PEDERSON | Copyright information

Agates are gemstones treasured for their unique stripes and striations. They are chalecedony quartz that forms in concentric layers in a wide range of colors and textures.

Each agate is formed when a cavity in a host rock is slowly filled, creating concentric bands like tree rings, according to the International Colored Gemstone Assocation.

Rough agate rock is dull and waxy. Its appearance often is compared to an old potato. That surface is all that's left of the host rock in wh...

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All about agates
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