Assertion: agate | /r/CapableOf | occur as nodule
Facets:
value: by siliceous matter
type: OTHER
value: in volcanic rocks
type: LOCATION
value: in former cavities
type: LOCATION
value: in ancient lavas
type: LOCATION
Source sentences:
text: Most agates occur as nodules in volcanic rocks or ancient lavas, in former cavities produced by volatiles in the original molten mass, which were then filled, wholly or partially, by siliceous matter deposited in regular layers upon the walls.