Assertion: obsidian | /r/HasProperty | fractured
Facets:
value: conveniently
type: MANNER
Source sentences:
text: This is because unlike stone, glass is made of pure silica instead of various mineral grains - so when obsidian is fractured it can create an edge with a thickness of only one molecule of silica!
text: Obsidian has been used in the ancient times because it can be fractured conveniently to produce knives and sharp blades.