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Table 9 Composition of phengite from three samples of TGU Grt-Ph schist

From: The Theodul Glacier Unit, a slab of pre-Alpine rocks in the Alpine meta-ophiolite of Zermatt-Saas, Western Alps

 KB860OK-Z129OK-Z131
56576266Ms1Ms2Ms3Ms3Ms4Ms5
SiO248.3648.5348.9148.3749.0950.9346.1047.8847.8347.80
TiO20.040.030.010.120.310.190.120.240.220.19
Al2O333.5132.9634.0833.6429.8327.4935.3232.7832.2532.69
FeO1.851.941.962.422.371.381.101.531.591.38
MgO1.611.721.621.982.833.670.861.601.911.70
Na2O0.740.690.770.740.710.510.890.870.951.04
K2O10.2710.4710.2710.279.9810.199.599.829.929.73
Total96.4796.3897.6597.5595.1294.3594.0994.7794.7094.53
Si3.1793.1983.1753.1553.2803.4093.0903.1943.1993.195
Al(IV)0.8210.8020.8250.8450.7200.5910.9100.8060.8010.805
Al(VI)1.7761.7571.7821.7411.6301.5771.8791.7711.7411.770
Ti0.0020.0010.0000.0060.0150.0100.0060.0120.0110.010
Fe2+0.1020.1070.1060.1320.1320.0770.0620.0850.0890.077
Mg0.1580.1690.1570.1930.2810.3660.0860.1590.1900.169
Na0.0940.0880.0970.0940.0910.0660.1150.1120.1230.134
K0.8610.8800.8500.8540.8510.8700.8200.8360.8460.829
XFe0.3920.3870.4040.4070.3200.1740.4170.3490.3180.313
  1. Traces of Cr2O3, MnO and CaO (< 0.1 wt% each), mineral formulas normalized to 11 oxygen