Assertion: obsidian | /r/CapableOf | break into piece
Facets:
value: with curved surfaces
type: OTHER
value: with very sharp edges
type: OTHER
Source sentences:
text: Obsidian’s conchoidal fracture allows it to break into pieces with curved surfaces and very sharp edges, and it has been found around the world fashioned into arrowheads, spear points, knives, axe heads, scrapers and various other cutting instruments.
text: This means the obsidian breaks into pieces with curved surfaces that are razor thin and extremely sharp.