Assertion: obsidian's fracture | /r/HasProperty | conchoidal
Facets:
Source sentences:
text: Because the natural glass does not have an orderly internal structure, obsidian will break into conchoidal fracture.
text: Obsidian has a strong luster and conchoidal fracture.
text: Because the natural glass does not have an orderly internal structure, obsidian will break into conchoidal fracture.