Structural relationship between pyrite and marcasite

Other| February 01, 1996 Structural relationship between pyrite and marcasite Istvan Dodony; Istvan Dodony Eotvos Lorand University, Department of Mineralogy, Budapest, Hungary Search for other works by this author on: GSW Google Scholar Mihaly Posfal; Mihaly Posfal 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 American Mineralogist (1996) 81 (1-2): 119–125. https://doi.org/10.2138/am-1996-1-215 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 Istvan Dodony, Mihaly Posfal, Peter R. Buseck; Structural relationship between pyrite and marcasite. American Mineralogist 1996;; 81 (1-2): 119–125. doi: https://doi.org/10.2138/am-1996-1-215 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu nav search search input Search input auto suggest search filter All ContentBy SocietyAmerican Mineralogist Search Advanced Search Abstract We studied pyrite spherules built of radiating crystals to establish the relationships among microstructure, composition, and macroscopic appearance. Results of high-resolution transmission electron microscopy (HRTEM) imaging and selected-area electron diffraction (SAED) show that many pyrite crystals contain planar faults perpendicular to one of the [001] axes. A comparison between HRTEM micrographs and images simulated for defect model structures indicates that the faults can be interpreted as single (101) layers of marcasite that disrupt the regular sequence of (002) layers in pyrite. Such a marcasite layer can be described as a boundary between two pyrite crystals that are related by a 21 screw axis parallel to [100]. Energy-dispersive X-ray spectrometry (EDS) indicates that such disordered pyrite crystals contain about 3 at% As. However, the distribution of As is uniform over heavily faulted and fault-free regions, indicating the As content is not related to the occurrence of marcasite lamellae in pyrite. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not currently have access to this article.