Assertion: elephant's tusk | /r/HasProperty | ivory
Facets:
value: beneath the outer layer of enamel
type: LOCATION
Source sentences:
text: The tusks are composed of ivory (dentine) beneath the outer layer of enamel, but the peculiar diamond pattern of the elephant’s tusk gives it a distinctive luster that ivory tusks of other mammals such as hippos, warthogs, walruses, and sperm whales don’t have, and African elephants are sometimes killed by poachers just for their ivory tusks.