Assertion: onyx | /r/HasProperty | porous
Facets:
value: extremely
type: DEGREE
value: in nature
type: LOCATION
value: naturally
type: MANNER
Source sentences:
text: The main difference between travertine and onyx is that travertine has a porous, lace-like texture while onyx is smooth and non-porous.
text: Since Onyx is a naturally porous substance, it's better to use a normal piece of cloth and water for cleaning purposes.
text: Dyeing is possible, since onyx and other varieties of chalcedony are porous in nature, and therefore keep the dyeing material adhere to itself.
text: In addition to being fragile, onyx is also extremely porous.