Assertion: opal | /r/HasProperty | volcanic origin
Facets:
Source sentences:
text: The opal, found mostly in the form of nodules, was of volcanic origin and was found predominantly within weathered layers of rhyolite.
text: The opal, found mostly in the form of nodules, was of volcanic origin and was found predominantly within weathered layers of rhyolite.
text: The opal, found mostly in the form of nodules, was of volcanic origin and was found predominantly within weathered layers of rhyolite.