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Flickr - brewbooks - Highly deformed, metamorphosed banded chert (1).jpg - Matanya
Bulletin 799 Plate 2A Harpers Schist photomicrograph.jpg - Jstuby
Novaculite (metachert) (Arkansas Novaculite, Devonian to Mississippian; Arkansas, USA) 7.jpg - Ser Amantio di Nicolao
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