Carbonaceous chondrite NWA 4967 was investigated by confocal Raman micro-spectroscopy. Olivine (Fa0-68), orthopyroxene with high En95-100 and low enstatite content En25-58, clinopyroxene, plagioclase, withlockite, cristobalite, coesite, graphite and diamond have been identified and characterized. Two groups of olivines have been detected: one with high Fo content Fo80-100 and another with relatively high Fa content Fa30–68. Diamond is common and exhibits the wide range of Raman shift between 1298 and 1339 cm–1 with dominant peak at 1332 cm–1 as in the case of terrestrial diamonds. Distributions of Raman peaks for olivines and carbon phases have been analyzed.
Ordinary chondrite NWA 4505 was investigated by confocal Raman micro-spectroscopy. Olivine (Fa0–22), orthopyroxene (Fs6–26), anorthoclase, HT plagioclase, whitlockite, graphite and diamond have been identified. Olivine and orthopyroxene are common and exhibit wide range of Raman shift. Distributions of Raman peaks for olivines and pyroxenes have been analyzed. Narrow, well defined bands of low Ca pyroxenes and olivines indicate on the high structural order and on the high petrologic type of chondrite. The wide range of Fa content in olivine and Fs in pyroxene may indicate that NWA 4505 is an unequilibrated ordinary chondrite.
Ordinary chondrites DaG 610 and NWA 869, as well as graphite nodules from Canyon Diablo iron meteorites were investigated by confocal Raman microspectroscopy in order to identify extraterrestrial minerals. Olivines, orthopyroxenes (enstatite, bronzite and hyperstene), clinopyroxenes (pigeonite), plagioclase, troilite and various carbon phases, mainly graphite and diamond have been identified and characterized.
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