Assertion: tourmaline | /r/HasProperty | known to ancient
Facets:
value: in the mediterranean
type: LOCATION
value: undoubtedly
type: DEGREE
Source sentences:
text: Although tourmaline (pronounced TOUR-mah-leen) was undoubtedly known to the ancients, since it occurred in many of the oriental mines that yielded other precious stones for the gem-loving Romans, there are no definite descriptions of it by the gem writers of the early periods.
text: Tourmalines were known in ancient times in the Mediterranean.