https://youtu.be/usNwe2ljdec
Flint - Wikipedia https://en.wikipedia.org/wiki/Flint Flint is a hard, sedimentary cryptocrystalline form of the mineral quartz, categorized as a variety .... Agate · Chalcedony · Chert · Eolith · Jasper · Nodule (geology) not to be confused with concretion · Obsidian · Onyx · Opal · Whinstone.
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