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- W2059566934 abstract "Abstract Despite high mosaicity and complex micro structures in pyroxenes from Mars average occupancies and average atomic positions of pigeonite were determined from X-ray single crystal and neutron and X-ray powder diffraction data. The chemical composition of selected single crystals varied between En 39 Fs 55 Wo 6 and En 60 Fs 34 Wo 6 . The average composition of the whole sample was determined from powder diffraction to be about En 43 Fs 51 Wo 6 . The ordering of the cations on the M1 and M2 positions, expressed by a partitioning or distribution coefficient K D , in the pigeonite structure was determined and a closure temperature of about 540 °C was estimated for crystals stemming from the core of our specimen. General trends of the crystal chemistry with K D are compared with literature data. From in-situ high temperature neutron powder data, however, it is deduced that a simple intra-phase-ordering process is not adequate, since diffusion processes between intimately intergrown augite and pigeonite phases at temperatures above 600 °C also take place. This makes the usual interpretation of structural data towards the prior history of the martian sample material doubtful." @default.
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- W2059566934 date "2010-07-01" @default.
- W2059566934 modified "2023-10-02" @default.
- W2059566934 title "Pyroxene from martian meteorite NWA856: Structural investigations by X-ray and neutron diffraction" @default.
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- W2059566934 doi "https://doi.org/10.1524/zkri.2010.1243" @default.
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