10.9 Additional CIPW Norm Minerals

Norm Mineral Symbol Oxide Proportions GFW
Calcite (cc): (CaO)(CO2) 100.087
Chromite (cm): (FeO)(Cr2O3) 223.834
Fluorite (ft): (CaF2) 78.075
Halite (hl): (NaCl) 58.440
Pyrite (pr): (FeS2) 119.975
Sodium Carbonate (nc): (Na2O)(CO2) 105.989
Thenardite (th): (Na2O)(SO3) 142.036
Zircon ( Z): (ZrO2)(SiO2) 183.307


These minerals are used in the CIPW instructions. However, they are not used in the Step by Step example or in the Norm Calculation tool. These minerals either contain volatile elements (CO2, SO3, F, Cl) that are missing from many analyses or trace elements (Cr, Zr).

used in the examples and the Norm Calculation tool.