The crystal chemistry of complex niobium and tantalum oxides II. Composition and structure of wodginite

J. Graham; M. R. Thornber

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Research Article| October 01, 1974

The crystal chemistry of complex niobium and tantalum oxides II. Composition and structure of wodginite

J. Graham;

J. Graham

Division of Mineralogy, CSIRO, Floreat Park, Western Australia, 6014

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M. R. Thornber

Division of Mineralogy, CSIRO, Floreat Park, Western Australia, 6014

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Author and Article Information

J. Graham

Division of Mineralogy, CSIRO, Floreat Park, Western Australia, 6014

M. R. Thornber

Division of Mineralogy, CSIRO, Floreat Park, Western Australia, 6014

Publisher: Mineralogical Society of America

Received: 07 Nov 1973

Accepted: 16 May 1974

First Online: 06 Jul 2018

Online ISSN: 1945-3027

Print ISSN: 0003-004X

Mineralogical Society of America

American Mineralogist (1974) 59 (9-10): 1040–1044.

Abstract

The structure of wodginite (non-centrosymmetric monoclinic space group Cc; ideal formula, MnX₁X₂Tao₂ where site X₂ contains 5-valent ions (and all the niobium) and the average valency of cations in site X₁ is 4) was determined by film methods to be an ordered form of the ixiolite structure. The a and b cell edges and angle β increase with manganese content, whereas c remains constant for wodginites from five localities in Western Australia.