Table 2. Mean chemical compositions of natural and homoionic samples obtained by point analysis in AEM.

SD denotes standard deviation.

Sample		SiO2	Al2O3	Fe2O3	MgO	CaO	NaO	K2O
CAR1	Mean n: 42	65.58	22.45	3.83	6.38	1.02	0.26	0.48
	SD	1.27	1.16	1.70	0.94	0.31	0.41	0.40
CAR1 Ca	Mean n: 26	65.94	21.68	3.14	5.72	3.01	0.20	0.28
	SD	0.48	0.38	0.75	0.42	0.37	0.22	0.15
CAR2	Mean n: 27	67.89	19.97	5.26	5.53	0.87		0.55
	SD	0.92	1.82	2.27	0.49	0.21		0.53
CAR2 Ca	Mean n: 24	67.85	22.02	2.54	4.61	2.93		0.05
	SD	1.07	0.79	0.42	0.36	0.29		0.22
LTBB	Mean n: 28	65.55	25.58	2.36	4.86	1.17	0.09	0.08
	SD	2.44	2.89	1.17	1.17	0.94	1.07	0.21
LTBB Ca	Mean n: 20	66.55	24.89	1.86	4.38	2.32
	SD	1.33	2.19	0.74	1.09	0.96
WYO	Mean n: 46	66.67	23.54	4.42	2.90	0.62	1.12	0.73
	SD	1.68	1.14	1.29	0.51	0.69	1.03	0.94
WYO Ca	Mean n: 31	66.94	23.67	4.49	2.56	2.29	0.02
	SD	1.29	0.62	0.79	0.41	0.48	0.09
ESB6	Mean n: 33	60.55	12.22	3.70	20.60	1.06	0.07	1.80
	SD	2.28	4.43	1.86	4.86	1.70	0.16	1.24
ESB6 Ca	Mean n: 19	60.94	14.80	4.80	16.21	2.05		1.19
	SD	2.60	7.34	2.27	5.66	1.00		1.15
RESQ	Mean n: 97	66.38	1.02	0.25	32.12	0.13	0.02	0.07
	SD	2.65	1.61	0.50	2.58	0.32	0.04	0.49
RESQ Ca	Mean n: 62	65.76	1.00	0.42	31.22	1.49		0.03
	SD	3.46	0.67	0.89	4.30	1.37		0.31
ROS	Mean n: 50	65.64	1.50	0.57	31.46	0.44	0.29	0.11
	SD	1.62	1.24	0.63	2.40	0.27	0.72	0.22
ROS Ca	Mean n: 50	64.27	1.20	1.02	32.02	1.43	0.02	0.02
	SD	1.31	0.49	2.05	2.28	0.32	0.17	0.07