Assertion: onyx | /r/CapableOf | display white bands
Facets:
value: against a black or brown background
type: OTHER
Source sentences:
text: It has a fine texture and black color; however some onyx also displays white bands or ribbons against a black or brown background and this variety is known as sardonyx.
text: However, some Onyx also displays white bands or ribbons against a black or brown background and this variety is known as "Sardonyx".