How to Identify Precious Stones
2016 9 26 In Ceylon precious stones are searched for in the beds of rivers, also in a gravel deposit generally ten or twenty feet below the surface . This deposit, called Nellan, consists of waterworn pebbles, together with pieces of granite, gneiss. The gems occur in pockets and in groups. Rubies are also found in dolomite.
What Kind Of Stones Have Iron Ore
Iron and steel to their science, properties . The coke "steals" the oxygen from the iron oxide in a chemical process called reduction, leaving behind a relatively pure liquid iron, while the limestone helps to remove the other parts of the rocky ore including clay, sand, and small stones, which form a waste slurry known as slag.