Assertion: moonstone | /r/HasAspect | refractive indices riof 1.520
Facets:
value: usually
type: TEMPORAL
value: with a birefringence of 0.005
type: OTHER
Source sentences:
text: Most moonstones usually have refractive indices (RI) of 1.520-1.525, with a birefringence of 0.005.