It is known that the Aztecs lived in the “copper-stone” age, but they had little copper. What did they make knives

It is known that the Aztecs lived in the “copper-stone” age, but they had little copper. What did they make knives, axes, spearheads and arrowheads?

The main tools of labor of the Aztecs were made not of copper, but of hard stone (mainly obsidian, less often flint).

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