Assertion: mineral's crystal | /r/MadeOf | the filling of vesicles
Facets:
value: by minerals
type: OTHER
Source sentences:
text: The crystals are formed by the filling of vesicles in volcanic and sub-volcanic rocks by minerals deposited from hydrothermal fluids; or by the dissolution of syn-genetic concretions and partial filling by the same, or other, minerals precipitated from water, groundwater or hydrothermal fluids.