Assertion: opal | /r/HasProperty | hydrated silicon dioxide
Facets:
value: chemically
type: MANNER
Source sentences:
text: Opal is a hydrated silicon dioxide.
text: Opals can be dehydrated when exposed to heat or chemicals.
text: Chemically, opal is hydrated silica, similar to quartz.
text: Opal is a hydrated silica mineral which comprises of microscopic spheres of silica which are bound together with water and silica and there are two forms of Opal, common and precious.
text: Opal by definition is hydrated silicon dioxide, always containing three to thirty percent water.