Table 1.

Average major and minor elements for olivine composition determined with EPMA

	QUE 97008, 12				MET 00452, 16		NWA 8649		NWA 8276					Semarkona
	c51	c61	c143	c150	c19	c111	c17	c87	c7	c69	c87	c88 (core)	c88 (rim inc.)	c47
SiO2	39.73	41.11	39.51	37.93	39.19	40.16	40.85	40.18	39.57	41.30	38.80	37.88	38.35	39.43
TiO2	0.02	0.07	0.01	0.04	0.02	0.02	0.05	0.06	0.03	0.08	0.01	0.03	0.01	0.04
Al2O3	0.10	0.10	0.16	0.04	0.09	0.07	0.03	0.08	0.15	0.15	0.21	0.03	0.03	0.05
MgO	46.75	52.91	44.01	40.34	44.16	49.19	52.09	49.08	45.49	54.38	43.96	39.26	42.03	45.49
FeO	12.72	5.38	15.17	20.89	15.81	10.19	7.26	10.02	14.12	2.91	15.94	21.36	18.09	13.52
CaO	0.22	0.25	0.22	0.20	0.26	0.19	0.18	0.22	0.22	0.24	0.30	0.24	0.24	0.24
Na2O	0.00	−0.01	0.03	−0.01	0.00	0.00	−0.02	−0.01	0.00	0.00	0.00	0.00	0.00	0.00
MnO	0.20	0.09	0.32	0.31	0.21	0.22	0.16	0.18	0.20	0.05	0.17	0.35	0.30	0.25
Cr2O3	0.61	0.55	0.55	0.29	0.61	0.52	0.30	0.59	0.56	0.59	0.45	0.49	0.47	0.56
Total	100.33	100.45	99.98	100.02	100.36	100.56	100.89	100.40	100.33	99.70	99.84	99.64	99.53	99.57
Si	0.989	0.988	1.00	0.984	0.990	0.986	0.984	0.987	0.991	0.989	0.985	0.990	0.988	0.990
Al	0.003	0.003	0.00	0.001	0.003	0.002	0.001	0.002	0.004	0.004	0.006	0.001	0.001	0.001
Mg	1.735	1.896	1.66	1.560	1.663	1.800	1.872	1.798	1.698	1.942	1.665	1.530	1.614	1.703
Fe	0.265	0.108	0.32	0.453	0.334	0.209	0.146	0.206	0.296	0.058	0.339	0.467	0.390	0.284
Ca	0.006	0.007	0.01	0.006	0.007	0.005	0.005	0.006	0.006	0.006	0.008	0.007	0.007	0.006
Mn	0.004	0.002	0.01	0.007	0.005	0.005	0.003	0.004	0.004	0.001	0.004	0.008	0.007	0.005
Cr	0.012	0.010	0.01	0.006	0.012	0.010	0.006	0.011	0.011	0.011	0.009	0.010	0.010	0.006
Sum Oct	2.022	2.022	2.00	2.032	2.021	2.029	2.031	2.025	2.016	2.018	2.024	2.022	2.027	1.987
Foa	86.8	94.6	83.8	77.5	83.3	89.6	92.7	89.7	85.2	97.1	83.1	76.6	80.6	85.7

^aFo = Mg / (Mg + Fe) mol%