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#flint #chert #fire starting #prehistoric tools #cryptocrystalline #conchoidal fracture

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#obsidian #volcanic glass #glassy texture #extrusive rock #felsic rock #conchoidal fracture

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#obsidian #volcanic glass #sharp rock #conchoidal fracture #glassy texture #black glass #natural glass

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#obsidian blade #stone tool #sharp rock #prehistoric weapon #cutting edge #conchoidal fracture #black point