Table 2 Stoichiometric mineral compositions for CA13-05A, based on assumed number of oxygen atoms shown.

Stoichiometric mineral compositions for CA13-05A, based on assumed number of oxygen atoms shown.. Note that Fe in zoisite was assumed to be 100% Fe3+ and Fe in all other minerals was assumed to be 100% Fe2+. Hbl, hornblende; Gln, glaucophane; Chl, chlorite; Aln, allanite.

CA13-05A
Hbl 1Hbl 2GlnChlZo 1Zo 2Aln
Si7.296.927.852.972.912.852.94
Ti0.020.030.010.010.010.060.01
Al1.241.911.772.322.412.092.01
Cr
Fe1.561.571.301.840.510.730.87
Mn0.020.010.010.020.010.020.02
Mg3.002.672.212.68
Ca1.501.470.121.771.701.40
Na0.820.931.98
K0.040.080.01
O2323231412.512.512.5
Al/(Al + Si)0.150.220.180.440.450.420.41
Fe/(Fe + Al)0.560.450.420.440.170.260.30
Fe/(Fe + Mg)0.340.370.370.41
Na/(Na + Ca)0.350.390.94
Na/(Na + K)0.950.92
Total oxides (wt %)97.198.997.186.196.797.281.0