GNR MINERALS PVT. LTD. Address: 43, Kodambakkam High Rd., T. Nagar, Chennai-600 017, Tamilnadu, India Contact Person: Manufacturer of Magnesium Oxide, Magnesium Sulphate, Manganese Oxide, Manganese Dioxide, Potassium Feldspar, Sodium Feldspar, Silica Powder (200,325,400), Iron Oxide Red, Barytes Powder