Assertion: opal's water content | /r/CapableOf | range by weight
Facets:
value: from 3 to 21%
type: OTHER
Source sentences:
text: Opal is a hydrated amorphous form of silica (SiO 2 ·nH 2 O); its water content may range from 3 to 21% by weight, but is usually between 6 and 10%.
text: Opal is a hydrated amorphous form of silica; its water content may range from 3 to 21% by weight, but is usually between 6 and 10%.