Compositional and structural systematics of the columbite group

Abstract

Other| June 01, 1995 Compositional and structural systematics of the columbite group T. Scott Ercit; T. Scott Ercit Canadian Museum of Nature, Research Division, Ottawa, ON, Canada Search for other works by this author on: GSW Google Scholar Michael A. Wise; Michael A. Wise Smithsonian Institute, United States Search for other works by this author on: GSW Google Scholar Petr Cerny Petr Cerny University of Manitoba, Canada Search for other works by this author on: GSW Google Scholar Author and Article Information T. Scott Ercit Canadian Museum of Nature, Research Division, Ottawa, ON, Canada Michael A. Wise Smithsonian Institute, United States Petr Cerny University of Manitoba, Canada Publisher: Mineralogical Society of America First Online: 02 Mar 2017 Online ISSN: 1945-3027 Print ISSN: 0003-004X Copyright © 1995 by the Mineralogical Society of America American Mineralogist (1995) 80 (5-6): 613–619. https://doi.org/10.2138/am-1995-5-619 Article history First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation T. Scott Ercit, Michael A. Wise, Petr Cerny; Compositional and structural systematics of the columbite group. American Mineralogist 1995;; 80 (5-6): 613–619. doi: https://doi.org/10.2138/am-1995-5-619 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 The systematics of the columbite group have been studied to quantify variations in composition and structure. Multiple regression methods involving 89 heated samples and five synthetic equivalents of columbite-group minerals give equations that permit prediction of the effects of composition on unit-cell parameters for fully ordered samples. The results are: a0 = 14.258 + 0.166Mn/(Mn + Fe) + 0.0072Ta/(Ta + Nb) − 0.06Ti − 0.02Sn + 0.05Sc; b0 = 5.7296 + 0.031Mn/(Mn + Fe) + 0.0024Ta/(Ta + Nb) − 0.024Ti − 0.009Sn + 0.02Sc; c0 = 5.0495 + 0.033Mn/(Mn + Fe) + 0.011Ta/(Ta + Nb) − 0.004Ti, where a0, b0, and c0 are the cell parameters (Å) calculated from unit-cell concentrations of elements. With these equations, crystal-chemical trends, the effects of heating experiments, the degree of cation order, and the structural effects of heterovalent cation substitution can be predicted for samples of columbite-group minerals. 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.