Assertion: bloodstone's variety | /r/Synonym | sardonyx
Facets:
Source sentences:
text: Some onyx displays white and lighter reddish bands or ribbons of silicon di-oxide against a brown background, this variety is known as Sardonyx.
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.