Swiss Journal of Geosciences

Table 5 Composition of plagioclase in SW9

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

	1	2
SiO₂	62.60	62.57
Al₂O₃	23.29	23.55
FeO	0.09	0.06
MgO	0.00	0.00
CaO	4.33	4.46
Na₂O	9.24	8.91
K₂O	0.10	0.09
Total	99.79	99.71
Si	2.780	2.776
Al	1.219	1.231
Fe²⁺	0.003	0.002
Mg	0.000	0.000
Ca	0.206	0.212
Na	0.795	0.766
K	0.006	0.005
SUM	5.011	4.994
Ab	78.98	77.92
An	20.46	21.56
Or	0.56	0.52

Total includes traces of Ti, Cr and Mn

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