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• W2134581039 abstract "Other| August 01, 1996 Orthopyroxene from the Serra de Mage Meteorite; a structure-refinement procedure for a Pbca phase coexisting with a C2/c exsolved phase M. Chiara Domeneghetti; M. Chiara Domeneghetti CNR, Universita di Pavia, Pavia, Italy Search for other works by this author on: GSW Google Scholar Vittorio Tazzoli; Vittorio Tazzoli Search for other works by this author on: GSW Google Scholar Tiziana Boffa Ballaran; Tiziana Boffa Ballaran Search for other works by this author on: GSW Google Scholar G. Mario Molin G. Mario Molin Search for other works by this author on: GSW Google Scholar American Mineralogist (1996) 81 (7-8): 842–846. https://doi.org/10.2138/am-1996-7-806 Article history first online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share MailTo Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation M. Chiara Domeneghetti, Vittorio Tazzoli, Tiziana Boffa Ballaran, G. Mario Molin; Orthopyroxene from the Serra de Mage Meteorite; a structure-refinement procedure for a Pbca phase coexisting with a C2/c exsolved phase. American Mineralogist 1996;; 81 (7-8): 842–846. doi: https://doi.org/10.2138/am-1996-7-806 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyAmerican Mineralogist Search Advanced Search Abstract An X-ray structure-refinement procedure was developed to characterize orthopyroxene from the Serra de Magé meteorite. In the studied sample, the orthorhombic phase coexists with exsolution lamellae of C2/c augite, parallel to (100), with aOpx* = aAug*⁠, [101]Opx* = cAug*⁠, bOpx* = bAug*⁠. Diifraction maxima of the monoclinic phase overlap those of the orthorhombic phase with h + l = 2n, yielding violations of the extinction conditions for space group Pbca and simulating the lower symmetry space group P2ica. Structural parameters of the Pbca phase together with the Wtpx parameter, which expresses the fraction of the C2/c phase present, were refined first. Fc values were calculated using the equation Fc=(1−WCpx)[Fc]Opx2+WCpx[Fc]Cpx2 with [Fc]Cpx values taken from the structure refinement of an augite. Observed Fa values were then corrected by subtracting the calculated contribution of the monoclinic phase with use of the equation Focorr=[Fo]2−[Fc]Cpx2WCpx and used for a further refinement of the orthorhombic phase. The final residual indices, Robs, were 2.11 and 1.78% for two crystals with dilferent augite contents. This refinement procedure confirms Pbca as the correct space group and provides more accurate structural parameters for the Serra de Magé orthopyroxene. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access." @default.
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• W2134581039 date "1996-08-01" @default.
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• W2134581039 title "Orthopyroxene from the Serra de Mage Meteorite; a structure-refinement procedure for a Pbca phase coexisting with a C2/c exsolved phase" @default.
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• W2134581039 doi "https://doi.org/10.2138/am-1996-7-806" @default.
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