I’ve been coming across videos of people breaking obsidian chunks to make arrowheads but could never find the answer why it could be broken with light hits with a rock, and then not break when in use with said weapon.
In: 564
Obisidian arrowheads and other tools are essentially stone age technology. The tech is no different from flint arrowheads and knifeblades, something done in a culture before metal becomes available and common. Copper and bronze are rare and expensive even now, so any place that is yet to discover or get good ways of refining iron on a larger scale is stuck with stone like obisidian for some of its consumable items.
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