Assertion: obsidian's color | /r/HasProperty | any color
Facets:
value: except black
type: OTHER
value: except dark gray
type: OTHER
value: except green
type: OTHER
value: except the colors of trap rock
type: OTHER
Source sentences:
text: Color is generally white through light gray, or red to tan and may include any color except dark gray, green or black (the colors of trap rock).