L-491 (Agate Geode): Collection includes raw material, outer surface, surrounding matrix, and naturally-weathered specimens. L-491 (Agate Geode) (Information obtained from Briar Creek Type Sheet) ...
Roula Khalaf, Editor of the FT, selects her favourite stories in this weekly newsletter. Agate, chalcedony formed from layers of quartz and often treacle-brown, has long been associated with 1970s ...
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