Assertion: precious opal | /r/HasAspect | internal structure
Facets:
Source sentences:
text: Precious opal shows a variable interplay of internal colors, and though it is a mineraloid, it has an internal structure.
text: Precious opal shows a variable interplay of internal colors, and though it is a mineraloid, it has an internal structure.
text: Precious opal shows a variable interplay of internal colors, and though it is a mineraloid, it has an internal structure.