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

Leake, Bernard Elgey; Woolley, A. R.; Birch, William D.; Burke, E. A. J.; Ferraris, Giovanni; Grice, Joel D.; Hawthorne, Frank C.; Kisch, Hanan J.; Кривовичев, В. Г.; Schumacher, John C.; Stephenson, N. C. N.; Whittaker, E. J. W.

doi:10.1180/0026461046810182

Cited by 198 publications

(158 citation statements)

References 12 publications

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“…The allocation of cations to the various groups was described by Leake et al (2004) (Hawthorne 1983), they are in general better than assuming Fe 3+ / (Fe 2+ + Fe 3+ ) = 0.0 (unless additional evidence indicates otherwise).…”

Section: Variation In the Chemical Composition Of Amphibolesmentioning

confidence: 99%

“…(3) Where B (Mg, Fe 2+ , Mn 2+ , Li) < 0.50, B (Ca, Na) > 1.50 and 0.5 < B Na < 1.50 apfu], we have the sodiccalcic group; note that the condition B (Ca, Na) > 1.00 apfu given in Leake et al (2004) is not correct.…”

Section: The B-group Cationsmentioning

confidence: 99%

“…Thus (LiCa), (LiMg), (NaMg) and their B Fe 2+ and B Mn 2+ analogues will all result in end-member compositions that cannot be decomposed into calcium-, lithium-, magnesium-iron-manganese-or sodium-group compositions. Leake et al 2004). This composition gives rise to a new root name, and hence to a new group of B (Na [Mg,Fe,Mn]) amphiboles in SCHEME 1.…”

Section: The B-group Cationsmentioning

confidence: 99%

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On the Classification of Amphiboles

Hawthorne¹,

Oberti²

2006

The Canadian Mineralogist

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Major issues involved in the classifi cation of the amphiboles are examined: (1) the role of (OH), Li and Fe 3+ , (2) the formal defi nition of a root name, (3) irreducible charge-arrangements and distinct species, (4) the use of prefi xes, (5) the principal chemical variables used in a classifi cation procedure, and (6) the use of the dominant-constituent principle. The current IMAapproved classifi cation scheme is based on the A, B and T groups of cations in the amphibole formula: AB 2 C 5 T 8 O 22 W 2 . We argue here that classifi cation should be based on the A, B and C groups of cations as (i) it is in these groups of cations that the maximum variation in chemical composition occurs, and (ii) as a result of (i), the scheme is more in accord with the IMA-sanctioned dominant-constituent principle, which governs the recognition (and approval) of distinct mineral species. Two new classifi cations are presented here; one is based on the A, B and C groups of cations, and another on the dominant-constituent principle. These two schemes were produced to illustrate (i) the problems inherent in the classifi cation of a group of minerals as complicated as the amphiboles, and (ii) the sometimes disparate needs of crystallographer, mineralogist, petrologist and geochemist. Scheme 1 conserves current formulae and names as much as possible, whereas scheme 2 minimizes the number of formulae and names as much as possible. The differences between the current classifi cation and the two schemes presented here are discussed, and we highlight the problems associated with each scheme.Keywords: amphibole group, classifi cation. SOMMAIRENous passons en revue les aspects importants d'une classifi cation des amphiboles: (1) le rôle de (OH), Li et Fe 3+ , (2) la défi nition formelle d'un nom "racine", (3) les arrangements irréductibles des charges et le concept des espèces distinctes, (4) l'utilisation de préfi xes, (5) les variables chimiques importantes utilisées dans la procédure de classifi cation, (6) l'utilisation du principe de la composante dominante. Le schéma de classifi cation accepté présentement par l'Association Internationale de Miné-ralogie (IMA) repose sur une considération des occupants cationiques des sites A, B et T d'une amphibole, AB 2 C 5 T 8 O 22 W 2 . Nous proposons plutôt de fonder le schéma de classifi cation sur les occupants des sites A, B et C, parce que c'est parmi ces groupes de cations que se trouve la plus grande variabilité en composition chimique. De plus, cette pratique donnerait un schéma plus en accord avec le principe de la composante dominante, qui régit la distinction et l'acceptation des espèces minérales distinctes. Nous présentons deux nouvelles classifi cations; une de celles-ci est fondée sur les occupants cationiques des sites A, B et C, et une autre est fondée sur le principe de la composante dominante. Ces deux schémas ont été préparés afi n d'illustrer (i) les problèmes intrinsèques d'une classifi cation d'une groupe de minéraux aussi compliqués que les amphiboles, et (i...

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Section: Variation In the Chemical Composition Of Amphibolesmentioning

confidence: 99%

Section: The B-group Cationsmentioning

confidence: 99%

Section: The B-group Cationsmentioning

confidence: 99%

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On the Classification of Amphiboles

Hawthorne¹,

Oberti²

2006

The Canadian Mineralogist

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“…The structural formulas for amphiboles were calculated by assuming total cations equalled 13 (except Ca, Na, and K; Leake 1978; Spear and Kimball 1984; Leake et al 2004;Yavuz 2007). The characteristic amphibole is calcic amphibole, which can be classified in a broad sense as hornblende (table 1).…”

Section: Mineral Chemistry and Metamorphic Conditionsmentioning

confidence: 99%

Fabric Development in a Middle Devonian Intraoceanic Subduction Regime: The Careón Ophiolite (Northwest Spain)

Barreiro

Catalán²,

Prior³

et al. 2010

The Journal of Geology

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“…Recently, amphibole nomenclature was revised by the Amphibole Subcommittee of CNMMN (Leake et al, 1997(Leake et al, , 2004. This nomenclature scheme defines prefixes (e.g., chloro, potassic) that are an essential part of the amphibole name.…”

Section: Introductionmentioning

confidence: 99%

Potassic-ferropargasite, a new member of the amphibole group, from Kabutoichiba, Mie Prefecture, central Japan

Banno

Miyawaki

Matsubara

et al. 2009

Journal of Mineralogical and Petrological Sciences

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(OH) 2 , is a new member of the amphibole group occurring in a schistose calcareous hornfels from Kabutoichiba, Kameyama, Mie Prefecture, central Japan. The amphibole occurs as black subhedral to anhedral crystals, up to about 700 µm long, associated with calcite, biotite, K -feldspar, plagioclase, scapolite, chlorite and titanite. Potassic -ferropargasite is optically biaxial negative with α = 1.680(2), β = 1.690 (calc.), γ = 1.698 (2) (100) Σ2.00 on the basis of O = 23, assuming OH + F + Cl = 2. The crystal structure of the clinoamphibole type was refined to an R of 6.5%.

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

Cited by 198 publications

References 12 publications

On the Classification of Amphiboles

On the Classification of Amphiboles

Fabric Development in a Middle Devonian Intraoceanic Subduction Regime: The Careón Ophiolite (Northwest Spain)

Potassic-ferropargasite, a new member of the amphibole group, from Kabutoichiba, Mie Prefecture, central Japan

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