Assertion: obsidian | /r/CapableOf | make knife
Facets:
value: among weapons
type: OTHER
value: among other tools
type: OTHER
Source sentences:
text: It was used to make scrapers, spear points, arrowheads, and knives among other tools and weapons.
text: Obsidian has been used in the ancient times because it can be fractured conveniently to produce knives and sharp blades.