Nomenclature of amphiboles: Additions and revisions to the international mineralogical association's 1997 recommendations

Bernard E. Leake, Alan R. Woolley, William D. Birch, Ernst A.J. Burke, Giovanni Ferraris, Joel D. Grice, Frank C. Hawthorne, Hanan J. Kisch, Vladimir G. Krivovichev, John C. Schumacher, Nicholas C.N. Stephenson, Eric J.W. Whittaker

Research output: Contribution to journalArticlepeer-review

152 Scopus citations

Abstract

The introduction of a fifth group of amphiboles, the Na-Ca-Mg-Fe-Mn-Li group, defined by 0.50 < B(Mg.Fe2+,Mn2+,Li) < 1.50 and 0.50 ≤ B(Ca,Na) ≤ 1.50 atoms per formula unit, with members whittakerite and ottoliniite, has been required by recent discoveries of B(Li,Na) amphiboles. These, and other new discoveries, such as sodicpedrizite (which is herein slightly, but significantly, changed from the original idealized formula), necessitate amendments to the IMA 1997 definitions ofthe Mg-Fe-Mn-Li, calcic, sodic-calcic and sodic groups. The discovery of obertiite and the finding of an incompatibility in the IMA 1997 subdivision of the sodic group require further amendments within the sodic group. All these changes, which have IMA approval, are summarized.

Original languageEnglish GB
Pages (from-to)1355-1362
Number of pages8
JournalCanadian Mineralogist
Volume41
Issue number6
DOIs
StatePublished - 1 Jan 2003

Keywords

  • Amphibole nomenclature
  • Ottoliniite
  • Sodicpedrizite
  • Whittakerite

ASJC Scopus subject areas

  • Geochemistry and Petrology

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