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Table 4 Composition of amphiboles in eclogite facies SW9

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

 ActActHblHblHbl
SiO255.253.9645.9648.7849.08
TiO20.010.050.20.220.13
Al2O33.235.796.657.779.21
FeO7.886.7420.5116.212.97
MnO0.050.030.390.470.04
MgO18.0117.7810.5911.5912.88
CaO11.029.679.9410.169.95
Na2O1.262.120.711.301.98
K2O0.070.190.070.120.11
Cl000.020.010.01
F0.230.260.140.150.24
Total96.9896.6795.2496.9296.71
Si7.8057.6177.1127.2357.173
Ti0.0000.0050.0230.0250.014
Al0.5380.9631.2131.3581.586
Fe2+0.9320.7962.6542.0091.585
Mn0.0060.0040.0510.0590.005
Mg3.7963.7422.4432.5632.806
Ca1.6701.4631.6481.6151.558
Na0.3450.5800.2130.3740.561
K0.0130.0340.0140.0230.021
Sum cations15.10515.20315.37215.26015.310
Al(IV)0.1950.3830.8880.7650.827
Al(VI)0.3430.5800.3250.5930.760
Sum Al(VI), Ti, Fe, Mn, Mg5.2725.5096.3856.0145.997
XMg0.8030.8250.4790.5600.639
Sum Ca, Na, K2.0282.0771.8752.0112.140
  1. Total includes traces of Cr. XMg = Mg/(Mg + Fe)