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Nomenclature of amphiboles: additions and revisions to the International Mineralogical Association's amphibole nomenclature

  • B. E. Leake (a1), A. R. Woolley (a2), W. D. Birch (a3), E. A. J. Burke (a4), G. Ferraris (a5), J. D. Grice (a6), F. C. Hawthorne (a7), H. J. Kisch (a8), V. G. Krivovichev (a9), J. C. Schumacher (a10), N. C. N. Stephenson (a11) and E. J. W. Whittaker (a12)...

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.

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Caballero, J.M., Oberti, R. and Ottolini, L. (2002) Ferripedrizite, a new monoclinic BLi amphibole endmember from the Eastern Pedriza Massif, Sierra de Guadarrama, Spain, and a restatement of the nomenclature of the Mg-Fe-Mn-Li amphiboles. American Mineralogist, 87, 976982.
Deer, W.A., Howie, R.A. and Zussman, J. (1997) Rockforming Minerals, 2B, Double-Chain Silicates (2nd edition), 764 pp. Geological Society, London.
Hawthorne, F.C., Cooper, M.A., Grice, J.D. and Ottolini, L. (2000) A new anhydrous amphibole from the Eifel region, Germany: description and crystal structure of obertiite, NaNa2(Mg3Fe3+Ti4+)Si8O22O2 . American Mineralogist, 85, 236241.
Leake, B.E. (1978) Nomenclature of amphiboles. Mineralogical Magazine, 42, 533563.
Leake, B.E., Woolley, A.R., Arps, C.E.S., Birch, W.D., Gilbert, M.C., Grice, J.D., Hawthorne, F.C., Kato, A., Kisch, H.J., Krivovichev, V.G., Linthout, K., Laird, J., Mandarino, J.A., Maresch, W.V., Nickel, E.H., Rock, N.M.S., Schumacher, J.C., Smith, D.C., Stephenson, N.C.N., Ungaretti, L., Whittaker, E.J.W. and Youzhi, G. (1997) Nomenclature of amphiboles: Report of the Subcommittee on Amphiboles of the International Mineralogical Association, Commission on New Minerals and Mineral Names. Mineralogical Magazine, 61, 295321.
Mogessie, A., Ettinger, K., Leake, B.E. and Tessadri, R. (2001) AMPH-IMA97: a hypercard program to determine the name of an amphibole from electron microprobe and wet analyses. Computers and Geosciences, 27, 11691178.
Oberti, R. and Ghose, S. (1993) Crystal-chemistry of a complex Mn-bearing alkali amphibole (‘tirodite’) on the verge of exsolution. European Journal of Mineralogy, 5, 11531160.
Oberti, R., Caballero, J.M., Ottolini, L., López-Andrés, S. and Herreros, V. (2000) Sodicferripedrizite, a new monoclinic amphibole bridging the magnesium-ironmanganese- lithium and the sodium-calcium groups. American Mineralogist, 85, 578585.
Oberti, R., Cámara, F., Ottolini, L. and Caballero, J.M. (2003) Lithium in amphiboles: detection, quantification and incorporation mechanisms in the compositional space bridging sodic and BLi amphibole. European Journal of Mineralogy, 15, 309319.
Oberti, R., Cámara, F. and Caballero, J.M. (2004 a) Ferri-ottoliniite and ferriwhittakerite, two new endmembers in the new Group 5 for amphiboles. American Mineralogist, 89, in press.
Oberti, R., Cámara, F., Caballero, J.M. and Ottolini, L. (2004 b) Sodic-ferri-ferropedrizite and ferri-clinoferroholmquistite. Mineral data and ordering of Acations in Li-rich amphiboles. The Canadian Mineralogist, 43, in press.
Skogby, H. and Rossman, G.R. (1991) The intensity of amphibole OH bands in the infrared absorption spectrum. Physics and Chemistry of Minerals, 18, 6468.

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