Assertion: opal | /r/HasProperty | bonded with additional silica
Facets:
Source sentences:
text: Opal is hydrated silicon dioxide - submicroscopic silica spheres bonded together with water and additional silica, sometimes containing the minerals cristobalite and tridymite.
text: Opal is hydrated silicon dioxide - submicroscopic silica spheres bonded together with water and additional silica, sometimes containing the minerals cristobalite and tridymite.