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Minerals Export Company. Farzin Rock Stone Minerals Export Company is a Leading exporter of high quality Minerals and Chemicals. FRS. Minerals started as a Firm in 1992 in Iran and started exports of Minerals from 1999 onwards.. The company is especially active in the field of minerals used in oil well drilling as Barite, Bentonite, walnut shell (nut plug), Gilsonite, and other minerals in Iran.