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Fortification Agates
Agates with banding that initiates from and conforms with the inner lining/walls (or "fortification") of the void within the host rock. When some agate nodules are cut and polished, the cross section can sometimes reflect the plan (or overhead) view of a castle or structure. Below are photos of fortification agate specimens from various localities. If you haven't already done so, check out our Introduction to Agates page.
All photographs courtesty of S. Beasley
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