Assertion: opal's property | /r/HasProperty | physical
Facets:
Source sentences:
text: Dissolution of biogenic opal as a function of its physical and chemical properties ,” Soil Sci.
text: They also have the same physical properties and appearance of natural opal.
text: Blue opal has many of the physical and optical properties common to all opals.
text: Although opal has a composition that includes SiO 2 , its physical properties are very different from quartz.