Minerals found in gem bearing gravel in the Ratnapura and Okkampitiya gem fields and their economic uses

Gunasinghe, A.L.M.2020-07-212020-07-212005https://dl-susl.nsf.gov.lk/handle/1/28784Natural ResourcesMinerals found in gem bearing gravel in the Ratnapura and Okkampitiya gem fields and their economic usesResearch ReportAP-NATURAL-175BSc01/AS/038Sabaragamuwa University of Sri Lanka