Assertion: opal's water content | /r/HasProperty | between 6 and 10%
Facets:
value: usually
type: DEGREE
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%.