Assertion: high fluoride | /r/MadeOf | charnokitic gnessis rocks
Facets:
value: as hornblend
type: MANNER
value: as biotite
type: MANNER
value: (amphibole)
type: OTHER
Source sentences:
text: The above study revealed Plonnaruwa district in the dry zone as containing high fluoride percentage in groundwater, which is further suggested by its occurrence of high-fluoride containing charnokitic gnessis rocks as biotite and hornblend (Amphibole) in a later study of Dharmagunewardhena et al. .