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Twinning in synthetic anorthite; a transmission electron microscopy investigation

1997; Mineralogical Society of America; Volume: 82; Issue: 1-2 Linguagem: Inglês

10.2138/am-1997-1-214

1945-3027

Huifang Xu, Peter R. Buseck, Michael A. Carpenter,

Mineralogy and Gemology Studies

Other| February 01, 1997 Twinning in synthetic anorthite: A transmission electron microscopy investigation Huifang Xu; Huifang Xu Arizona State University, Department of Geology, Tempe, AZ, United States Search for other works by this author on: GSW Google Scholar Peter R. Buseck; Peter R. Buseck Search for other works by this author on: GSW Google Scholar Michael A. Carpenter Michael A. Carpenter Search for other works by this author on: GSW Google Scholar American Mineralogist (1997) 82 (1-2): 125–130. https://doi.org/10.2138/am-1997-1-214 Article history first online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation Huifang Xu, Peter R. Buseck, Michael A. Carpenter; Twinning in synthetic anorthite: A transmission electron microscopy investigation. American Mineralogist 1997;; 82 (1-2): 125–130. doi: https://doi.org/10.2138/am-1997-1-214 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 Transmission electron microscopy (TEM) has revealed dense, complex twins in synthetic anorthite crystals formed by annealing CaAl2Si2O8 glass. The crystals are dominated by Carlsbad and Carlsbad-albite twins, with small amounts of albite twins. All the composition planes are parallel to (010). High-resolution TEM images show the twin boundaries to be coherent. Selected-area electron diffraction (SAED) patterns containing the b*-c* reciprocal plane are useful for distinguishing these twins. Extremely dense Carlsbad twins at the unit-cell scale indicate that additional energy caused by the Carlsbad twin boundaries in highly disordered anorthite is lower than that caused by albite twin boundaries. We propose that for anorthite with an initially disordered structure the total energy induced by Carlsbad twinning is lower than that caused by albite twinning and higher than that caused by albite twinning in anorthite with an initially ordered structure. 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.