Despite the absence of an apparent triangular pattern in crystal structure, we observe unusually well pronounced 1/3 magnetization plateaus quasi one-dimensional Ising spin chain compound CoGeO$_3$ which belongs to class pyroxene minerals. We succeeded uncovering detailed microscopic structure plateau phase by means neutron diffraction. observed changes initial antiferromagnetic zero-field that...

Al Huwaysah 010 is an ungrouped achondrite meteorite, recently referred to as a brachinite-like meteorite. This showing fine-grained assemblage of low-Ca pyroxene and opaque phases, strongly reduced in comparison other brachinites. The occurrence some tiny plates graphite oldhamite this meteorite suggests that partial melt residue has experienced further reduction process. Olivine, the most abu...

[1] The surface materials of Acidalia and Chryse planitiae, Mars, have been variably interpreted morphologically as basalt and compositionally as andesite or altered basalt. A thorough survey using the Compact Reconnaissance Imaging Spectrometer for Mars (CRISM) near‐infrared spectrometer reveals olivine and high‐calcium pyroxene signatures in the shallow subsurface exposed by impact craters. T...

Multiple chondritic meteorite fragments have been found in two sedimentary rock samples from an end-Permian bed at Graphite Peak in Antarctica. The Ni/Fe, Co/Ni, and P/Fe ratios in metal grains; the Fe/Mg and Mn/Fe ratios in olivine and pyroxene; and the chemistry of Fe-, Ni-, P-, and S-bearing oxide in the meteorite fragments are typical of CM-type chondritic meteorites. In one sample, the met...

[1] We present a revised model of soil evolution constrained by the recent LSCC data for lunar soils. In addition to an observed universal increase in feldspathic components in the finer fractions of soils [Taylor et al., 2001, 2003a, 2003b], both differential melting and lateral mixing processes appear to be required during the evolution of lunar soils. We propose mare-highland mixing of a sig...

Dyl et al. (2011) state that their results confirm the conclusion of J. Simon et al. (2005) that the pyroxene in Wark–Lovering rims (Wark and Lovering, 1977) found on Ca-, Al-rich refractory inclusions has lower Ti/Ti ratios than the primary pyroxene in the interiors of inclusions. While true, the claim is misleading because J. Simon et al. (2005) concluded that there was no Ti in the rims, whe...