Prame, B.2013-10-102013-10-102013Vidurava, 30(01):p.26-32https://dl.nsf.gov.lk/handle/1/9958Natural ResourcesMineralsRocksEconomic viabilityMineral classificationChemical classficationIndustriesClay depositsFeldsparSilica quartzSilica sandMineral sandLimestoneCrystalline limestoneGraphiteIron oreGemstonesConstruction materialsNational developmentMineral productionMinerals, rocks and their economic significanceA