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Pyroxferroite - Wikipedia, the free encyclopedia
Pyroxferroite (Fe +2 ,Mn,Ca)SiO 3 is a silicate of the pyroxene group with a triclinic crystal structure. It has a hardness between 4.5 and 5.5, and is yellowish in colour. Pyroxferroite was firs...
en.wikipedia.org/wiki/Pyroxferroite |
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General Pyroxferroite Information ... Pyroxferroite Image ... Pyroxferroite Crystallography...
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Pyroxferroite-Pyroxmangite Series ... Classification of Pyroxferroite ... Type Occurrence of Pyroxferroite...
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Samples of pyroxferroite were originally collected within Apollo XI mission rocks, and the mineral was described as a new species in 1970. Recent work on pyroxmangite [formula] and related species found at Franklin, New Jersey, unequivocally confirms the presence of the iron-analogue at the locality,
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Pyroxferroite 2001 c Crystal Data: Mineral Data Publishing, ver sion 1.2 (Fe2+ ; Mn2+; Ca)SiO3 As rudimentary crystals and discrete grains. Hardness = n.d. Triclinic. All rights reserved. No par t of t his publication may b e reproduced, stored in a retrieval system or trans mitt ed in any form or by any means,
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at 22 kb and 1200~ Lunar pyroxferroite was separated by means of heavy ... Calcium, if it entered the pyroxferroite structure, would probably go into ...
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Synthetic Ca0.15Fe0.85SiO3 pyroxenoid has the same (pyroxmangite) structure and very nearly the same composition as pyroxferroite, a new mineral found in Apollo 11 lunar samples. The synthetic material is not stable below pressures of approximately 10 kilobars.
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The reconstructed three-phase symplectite compositions plot close to lunar (metastable) pyroxferroite on the pyroxene quadrilateral diagram and indicate that pyroxene compositions ranged into the "forbidden region" and eventually crystallized pyroxferroite, which subsequently broke down to the three-phase symplectite...
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The pyroxferroite structure contains single silicate chains having a repeat period of seven silicon tetrahedra. The chains are separated by bands of ...
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Title:; Mössbauer spectra of synthetic Ca-Fe pyroxenoids and lunar pyroxferroite ... five sites and two sites in Ca0.15Fe0.85SiO3 (pyroxferroite); and five sites and four sites in FeSiO3 (ferrosolite III). Disorder of iron and calcium which exists in the two calcium-bearing pyroxenoids is not readily apparent in the spectra.
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