This petrafm data set is formed by 100 classified volcanic rock samples from Ontario (Canada). The three parts are:
\([A: {Na}_2 O + K_2 O; F: Fe O + 0.8998 Fe_2 O_3 ; M: Mg O]\)
Rocks from the calc-alkaline magma series (25) can be well distinguished from samples from the tholeiitic magma series (75) on an AFM diagram.
petrafmAn object of class data.frame with 100 rows and 4 columns.