Nomenclature of Amphiboles: Additions and Revisions to the International Mineralogical Association's Amphibole Nomenclature

B. E. Leake, A. R. Woolley, W. D. Birch, E. A.J. Burke, G. Ferraris, J. D. Grice, F. C. Hawthorne, H. J. Kisch, V. G. Krivovichev, J. C. Schumacher, N. C.N. Stephenson, E. J.W. Whittaker

Research output: Contribution to journalArticlepeer-review

92 Scopus citations

Abstract

The introduction of a fifth amphibole group, 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 a.f.p.u. (atoms per formula unit), with members whittakerite and ottoliniite, has been required by recent discoveries of B(LiNa) amphiboles. This, and other new discoveries, such as sodicpedrizite (which, here, is changed slightly, but significantly, from the original idealized formula), necessitate amendments to the IMA 1997 definitions of the 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, requires further amendments within the sodic group. All these changes, which have IMA approval, are summarized.

Original languageEnglish
Pages (from-to)209-215
Number of pages7
JournalMineralogical Magazine
Volume68
Issue number1
DOIs
StatePublished - 1 Feb 2004

Keywords

  • Amphibole nomenclature
  • Obertiite
  • Ottoliniite
  • Sodic amphiboles
  • Sodicpedrizite
  • Whittakerite

ASJC Scopus subject areas

  • Geochemistry and Petrology

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