Assertion: dark opal | /r/HasAspect | thin colour bar
Facets:
value: on black potch
type: LOCATION
value: very
type: DEGREE
Source sentences:
text: Even expensive black/dark opals may have only a very thin colour bar on black potch (Colourless Opal).
text: Even expensive black/dark opals may have only a very thin colour bar on black Potch.