Parvo-mangano-edenite and parvo-manganotremolite, two new Group 5 monoclinic amphiboles from Fowler, New York, and comments on the solid solution between Ca and Mn2+ at the M4 site. (Articolo in rivista)

Type

• Articolo in rivista (Classe)
• Prodotto della ricerca (Classe)

Label

• Parvo-mangano-edenite and parvo-manganotremolite, two new Group 5 monoclinic amphiboles from Fowler, New York, and comments on the solid solution between Ca and Mn2+ at the M4 site. (Articolo in rivista) (literal)

Anno

• 2006-01-01T00:00:00+01:00 (literal)

Alternative label

• Oberti R.; Camara F.; Della Ventura G.; Iezzi G.; Benimoff A.I. (2006)
  Parvo-mangano-edenite and parvo-manganotremolite, two new Group 5 monoclinic amphiboles from Fowler, New York, and comments on the solid solution between Ca and Mn2+ at the M4 site.
  in The American mineralogist
  (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

• Oberti R.; Camara F.; Della Ventura G.; Iezzi G.; Benimoff A.I. (literal)

Pagina inizio

• 526 (literal)

Pagina fine

• 532 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume

• 91 (literal)

Rivista

• ?The ?American mineralogist (Rivista)

Note

• ISI Web of Science (WOS) (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni

• ROBERTA OBERTI,1,* FERNANDO CÁMARA,1 GIANCARLO DELLA VENTURA,2 GIANLUCA IEZZI,3 AND ALAN I. BENIMOFF4 1CNR-Istituto di Geoscienze e Georisorse, Unità di Pavia, via Ferrata 1, I-27100 Pavia, Italy 2Dipartimento di Scienze Geologiche, Università di Roma Tre, largo S. L. Murialdo 1, I-00146 Roma, Italy 3Dipartimento di Scienze della Terra, Università G. D.Annunzio, I-66013 Chieti Scalo, Italy 4Department of Engineering Science and Physics, College of Staten Island, New York 10314-0000, U.S.A. (literal)

Titolo

• Parvo-mangano-edenite and parvo-manganotremolite, two new Group 5 monoclinic amphiboles from Fowler, New York, and comments on the solid solution between Ca and Mn2+ at the M4 site. (literal)

Abstract

• This work reports the crystal-chemical characterization of Mn-rich amphiboles from the Grenville Marble of the Arnold mine, Fowler, St. Lawrence Co., New York (U.S.A.), which were previously described by Benimoff et al. (1991) as .manganoan silicic edenite.. According to the new nomenclature scheme for monoclinic amphiboles (Leake et al. 2004) the ideal composition of reference, ANa B(CaMn) CMg5 T(Si7Al)O22(OH)2 with Ca > 1 apfu, is an end-member of the newly deÞ ned Group 5, and is named parvo-mangano-edenite. Re-examination of the original rock specimen showed signiÞ cant inter- and intra- crystalline compositional variations, which can be expressed by the ANa.1 TAl.1 A ¦ 1 TSi1 and BMn2 BCa.2 exchange vectors. The Þ rst vector leads to parvo-manganotremolite, ideally A ¦ B(CaMn)CMg5 TSi8O22(OH)2 with Ca > 1. The second mechanism was never found to reach Mn dominance; however, crystal-chemical analysis does not provide any evidence of structural limits, and thus the magno-calcic counterparts of the Group 5 amphiboles of this work may occur in similar but Mn-richer genetic environments. The presence of Mn at the B site helps to stabilize the charge arrangement of edenite. The parvo-mangano-edenite crystal with composition closest to the end-member, i.e., A(Na0.74 K0.02)B(Ca1.27Mn0.73)C(Mg4.51Mn2+ 0.28Fe2+ 0.05Fe3+ 0.03Al0.12Ti0.01)T(Si7.07Al0.93)O22(OH)2, has a = 9.8260(5), b = 18.0487(9), c = 5.2840(4) Å, ß = 104.55(1)º, V = 907.1 Å3 (Z = 2); the calculated density is 3.11 g/cm3. The parvo-mangano tremolite crystal, with composition A(Na0.44K0.01)B(Ca1.13Mn0.83Na0.04)C(Mg 4.69Mn2+ 0.21Fe2+ 0.03Fe3+ 0.01Al0.06)T(Si7.52Al0.48)O22 (OH)2, has a = 9.7807(5), b = 18.0548(9), c = 5.2928(4) Å, ß = 104.19(1)º, V = 906.1 Å3 (Z = 2); the calculated density is 3.08 g/cm3. The different compositions are virtually indistinguishable under the optical microscope, but can be identiÞ ed by a measure of their unit-cell parameters. The single-crystal FTIR spectrum of parvo-mangano-edenite in the OH-stretching region shows two main absorptions at 3711 and 3671 cm.1, plus shoulders at 3695, 3660, and 3641 cm.1, respectively. FTIR spectroscopy indicates extensive short-range-order of cations in these amphiboles. (literal)

Prodotto di

• Istituto di geoscienze e georisorse (IGG) (Istituto)
• Metodologie integrate per la conoscenza di processi e materiali geologici e del loro impatto sull'uomo e l'ambiente (TA.P04.014.002) (Modulo)

Autore CNR

• FERNANDO CAMARA ARTIGAS (Persona)
• ROBERTA MARIA OBERTI (Persona)

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• Parole chiave di "Parvo-mangano-edenite and parvo-manganotremolite, two new Group 5 monoclinic amphiboles from Fowler, New York, and comments on the solid solution between Ca and Mn2+ at the M4 site." (Insieme di parole chiave)

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Autore CNR di

• ROBERTA MARIA OBERTI (Persona)
• FERNANDO CAMARA ARTIGAS (Persona)

Prodotto

• Istituto di geoscienze e georisorse (IGG) (Istituto)
• Metodologie integrate per la conoscenza di processi e materiali geologici e del loro impatto sull'uomo e l'ambiente (TA.P04.014.002) (Modulo)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#rivistaDi

• ?The ?American mineralogist (Rivista)

Insieme di parole chiave di

• Parole chiave di "Parvo-mangano-edenite and parvo-manganotremolite, two new Group 5 monoclinic amphiboles from Fowler, New York, and comments on the solid solution between Ca and Mn2+ at the M4 site." (Insieme di parole chiave)