CAUTION: Some of these materials are toxic in their dry unfired or fired state. You should always use a dust mask when working with these materials. We have an inexpensive, Toxic Dust Mask available. Also Material Safety Data Sheets are available on request or can be downloaded from MSDS Search. These materials have always been potentially harmful, so let’s get serious about safe handling. magcarb-mangdiox Magnesium Carbonate - 1 pound magcarb-1$5.08 Manganese Dioxide - 1 pound mangdiox-1$1.75 Manganese Carbonate - 1/2 pound mangcarb-12$3.16 5 pounds magcarb-5$23.35 5 pounds mangdiox-5$4.55 1 pound mangcarb-1$6.00 10 pounds magcarb-10$43.90 10 pounds mangdiox-10$8.70 5 pounds mangcarb-5$28.45 25 pounds magcarb-25$103.00 25 pounds mangdiox-25$20.75 10 pounds mangcarb-10$53.70 55 pounds magcarb-50$193.00 50 pounds mangdiox-50$39.00