Assertion: giant clam's shell | /r/HasAspect | dark olive
Facets:
value: to black periostracum
type: LOCATION
value: to deep royal blue nacre
type: LOCATION
Source sentences:
text: The light-colored shell morph has a yellow-green to light brown periostracum and white to light blue or light purple nacre while the darker shell morph has a dark olive green to black periostracum and deep royal blue nacre (McMahon 1991).