Assertion: onyx | /r/HasProperty | rare stone
Facets:
Source sentences:
text: Onyx is a rare stone and it’s rarely used for countertops.
text: Onyx is rare.
text: While Onyx is more expensive than others, it is also one of the rarest material ever used in home decor and interior design.
text: Onyx is a rare stone, formed when limestone dissolves and is redeposited as a new kind of stone.