Assertion: onyx | /r/HasProperty | applied to black portion of onyx
Facets:
value: frequently
type: TEMPORAL
value: for at least the last century
type: TEMPORAL
Source sentences:
text: But, throughout the ages, onyx has also been applied to similarly broad ... banded chalcedony of colors other than black and white -- e.g., reddish brown and white; and, for at least the last century, onyx has frequently been applied to only the black portion of onyx, as just defined, and in the marketplace extended to apply to any black chalcedony, be it natural or dyed.