The refinement of the crystal structure of a synthetic non-stoichiometric Sr feldspar

H. D Grundy; Jun Ito

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Research Article| December 01, 1974

The refinement of the crystal structure of a synthetic non-stoichiometric Sr feldspar

H. D Grundy;

H. D Grundy

Department of Geology, McMaster University, Hamilton, Ontario, Canada L8S 4M1

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Jun Ito

Department of Geological Sciences, Harvard University, Cambridge, Massachusetts 02138

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Author and Article Information

H. D Grundy

Department of Geology, McMaster University, Hamilton, Ontario, Canada L8S 4M1

Jun Ito

Department of Geological Sciences, Harvard University, Cambridge, Massachusetts 02138

Publisher: Mineralogical Society of America

Received: 22 Jan 1974

Accepted: 02 Jul 1974

First Online: 06 Jul 2018

Online ISSN: 1945-3027

Print ISSN: 0003-004X

Mineralogical Society of America

American Mineralogist (1974) 59 (11-12): 1319–1326.

Abstract

The crystal structure of a synthetic Sr feldspar with vacancies on the alkali cation site has been refined in space group C2/m using 3-D counter diffractometer data and full-matrix least-squares methods. The chemical composition of the feldspar is Sr_0.84Na_0.03□_0.13A1 rid=_1.03Si_2.29O₈, with cell parameters a = 8.3282(8) Å, b = 12.9801(12), c = 7.1358(6), β = 115.599(3)°. The weights, 1/σ², were used throughout the refinement and the final weighted R-factor for 1193 non-equivalent reflections was 4.0 percent. The average Al/Si distribution over the T₁ and T₂ sites determined by least-squares refinement are 0.48(8)Al and 0.39(8)A1, respectively.