40 CFR Part 98, Table 1
Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
| Carbonate | Mineral name(s) | CO2 emission factor a |
|---|---|---|
| BaCO3 | Witherite, Barium carbonate | 0.223 |
| CaCO3 | Limestone, Calcium Carbonate, Calcite, Aragonite | 0.44 |
| Ca(Fe,Mg,Mn)(CO3)2 | Ankerite b | 0.408-0.476 |
| CaMg(CO3)2 | Dolomite | 0.477 |
| FeCO3 | Siderite | 0.38 |
| K2 CO3 | Potassium carbonate | 0.318 |
| Li2 CO3 | Lithium carbonate | 0.596 |
| MgCO3 | Magnesite | 0.522 |
| MnCO3 | Rhodochrosite | 0.383 |
| Na2 CO3 | Sodium carbonate, Soda ash | 0.415 |
| SrCO3 | Strontium carbonate, Strontianite | 0.298 |
a Emission factors are in units of metric tons of CO2 emitted per metric ton of carbonate-based material.
b Ankerite emission factors are based on a formula weight range that assumes Fe, Mg, and Mn are present in amounts of at least 1.0 percent.