Nature Photos
Historic and Physical Geology

Flint
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Sedimentary rock, granular cryptocrystalline silica (crystaline structure too fine
to see with an ordinary microscope.)
It is similar to Chert but uaually dull and dark. Often occures as lumps or nodules
in Cretaceous calcareous rocks.
(Reference - Physical Geology - Leet and Judson/ third edition)

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