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. Author manuscript; available in PMC: 2019 Apr 24.

Published in final edited form as: Meteorit Planet Sci. 2015 Apr 24;50(5):976–1004. doi: 10.1111/maps.12445

Table 4.

Iris clinopyroxene compositions from TEM and SEM EDS.

	Normalized oxide weight %
Spectrum	SiO₂	TiO₂	Al₂O₃	Cr₂O₃	MgO	CaO	FeO	Na₂O^a	Phase^b
TEM 34	55.66	0.65	0.55	2.96	13.01	18.79	6.27	2.12	En₃₆Fs₁₀Wo₃₈Ko₁₁Ja₀₅
SEM 16	53.45	0.68	0.39	2.64	14.22	19.12	7.96	1.55	En₃₉Fs₁₂Wo₃₈Ko₀₈Ja₀₂
	Cations per 6 oxygens
Spectrum	Si	Ti	Al	Cr	Mg	Ca	Fe	Na	ΣCations	t (nm)

TEM 34	2.041	0.018	0.024	0.086	0.711	0.738	0.192	0.151	3.961	153
SEM 16	1.985	0.019	0.017	0.077	0.787	0.761	0.246	0.111	4.003	XPP

^a

Na concentration extrapolated to t=0 from a sequence of spectra.

^b

En=enstatite, Fs=ferrosilite, Wo=wollastonite, Ko=kosmochlor, Ja=jadeite.