Assertion: opal's variety | /r/AtLocation | precambrian granite
Facets:
value: in mason county
type: LOCATION
value: within the llano uplift
type: LOCATION
Source sentences:
text: Colorless and light-blue varieties of topaz are found in Precambrian granite in the vicinity of Streeter in Mason County.
text: Colorless and light-blue varieties of topaz are found in Precambrian granite in Mason County, Texas within the Llano Uplift.