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SX-50 and SX-100 microprobes database (Dept. of Geosciences, UMass Amherst) | Print date: 06/26/2022 (13:20)
Calculate weigth-% element (oxide) from a mineral formula
Enter a mineral formula to recalculate wt-% of each element (and oxide if applicable). You can specify the oxidation state of each cation
Enter a mineral formula here below...
Element name is case sensitive (e.g "Na" OK, but not "na").
You can specify the oxidation states (e.g. (Fe3+)2O3 or Fe3+2O3) to correctly calculate the oxide weight-%. If the oxidation state is not recognized (error in oxide column), try to enter the oxide name manually after clicking a first time on "Calculate weight-%...").
If needed, make sure to open and close parenthesis correctly (e.g. CaMg(CO3)2).
For OH- and/or CO2-bearing phases, it is recommended to enter the OH or CO2 term at the end of the mineral formula.
For hydrated phases (e.g. SiO2 . 1.5H2O), ensure a) to separate the H2O term from the formula by " . " (space dot space), b) to put the multiplier in front of H2O, and c) NOT to use any parenthesis (e.g. "8(H2O)2(OH)" is not accepted).
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