Swiss Journal of Geosciences

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

	KB860				OK-Z129			OK-Z131
	56	57	62	66	Ms1	Ms2	Ms3	Ms3	Ms4	Ms5
SiO₂	48.36	48.53	48.91	48.37	49.09	50.93	46.10	47.88	47.83	47.80
TiO₂	0.04	0.03	0.01	0.12	0.31	0.19	0.12	0.24	0.22	0.19
Al₂O₃	33.51	32.96	34.08	33.64	29.83	27.49	35.32	32.78	32.25	32.69
FeO	1.85	1.94	1.96	2.42	2.37	1.38	1.10	1.53	1.59	1.38
MgO	1.61	1.72	1.62	1.98	2.83	3.67	0.86	1.60	1.91	1.70
Na₂O	0.74	0.69	0.77	0.74	0.71	0.51	0.89	0.87	0.95	1.04
K₂O	10.27	10.47	10.27	10.27	9.98	10.19	9.59	9.82	9.92	9.73
Total	96.47	96.38	97.65	97.55	95.12	94.35	94.09	94.77	94.70	94.53
Si	3.179	3.198	3.175	3.155	3.280	3.409	3.090	3.194	3.199	3.195
Al(IV)	0.821	0.802	0.825	0.845	0.720	0.591	0.910	0.806	0.801	0.805
Al(VI)	1.776	1.757	1.782	1.741	1.630	1.577	1.879	1.771	1.741	1.770
Ti	0.002	0.001	0.000	0.006	0.015	0.010	0.006	0.012	0.011	0.010
Fe²⁺	0.102	0.107	0.106	0.132	0.132	0.077	0.062	0.085	0.089	0.077
Mg	0.158	0.169	0.157	0.193	0.281	0.366	0.086	0.159	0.190	0.169
Na	0.094	0.088	0.097	0.094	0.091	0.066	0.115	0.112	0.123	0.134
K	0.861	0.880	0.850	0.854	0.851	0.870	0.820	0.836	0.846	0.829
X_Fe	0.392	0.387	0.404	0.407	0.320	0.174	0.417	0.349	0.318	0.313

Traces of Cr₂O₃, MnO and CaO (< 0.1 wt% each), mineral formulas normalized to 11 oxygen

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