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Chert sedimentary rock rocks geology microcrystalline cryptocrystalline fracture gray conchoidal silica smooth types stone weapons fossils masses material inches specimenFlint chert Chert rock rocksXapian: internal source documentation: backends/chert/chert_values.h.
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Xapian: Internal Source Documentation: backends/chert/chert_values.h

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Chert Rock | History | Origin

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