https://w3id.org/framester/conceptnet5/data/en/opal <https://w3id.org/framester/conceptnet5/schema/EtymologicallyDerivedFrom> <https://w3id.org/framester/conceptnet5/data/en/opal> <https://w3id.org/framester/conceptnet5/cla/fr.opale> <https://w3id.org/framester/conceptnet5/cla/la.opalus> <https://w3id.org/framester/conceptnet5/schema/InstanceOf> <https://w3id.org/framester/conceptnet5/data/en/chemical_substance> <https://w3id.org/framester/conceptnet5/data/en/mineral> <https://w3id.org/framester/conceptnet5/schema/IsA> <https://w3id.org/framester/conceptnet5/data/en/opaque_thing> <https://w3id.org/framester/conceptnet5/data/en/semi_precious_stone> <https://w3id.org/framester/conceptnet5/data/en/precious_stone> risorse dalla linked data cloud