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Fluoro-tremolite from the Limecrest-Southdown quarry, Sparta, New Jersey, USA: crystal chemistry of a newly approved end-member of the amphibole supergroup

Published online by Cambridge University Press:  28 February 2018

Roberta Oberti
Affiliation:
CNR-Istituto di Geoscienze e Georisorse, Sede secondaria di Pavia, via Ferrata 1, 27100 Pavia, Italy
Fernando Cámara
Affiliation:
Dipartimento di Scienze della Terra “A. Desio”, Università degli Studi di Milano, via Mangiagalli, 34, 20133 Milano, Italy
Fabio Bellatreccia
Affiliation:
Dipartimento di Scienze, Università Roma Tre, Largo San Leonardo Murialdo 1, 00146, Roma, Italy
Francesco Radica
Affiliation:
Dipartimento di Scienze, Università Roma Tre, Largo San Leonardo Murialdo 1, 00146, Roma, Italy School of Science and Technology-Geology Division, University of Camerino, Via Gentile III da Varano, 62032 Camerino, Italy
Antonio Gianfagna
Affiliation:
Dipartimento di Scienze della Terra, Università di Roma “La Sapienza”, p.le Aldo Moro 5, 00185 Roma, Italy
Massimo Boiocchi
Affiliation:
Centro Grandi Strumenti, Università di Pavia, via Bassi 21, 27100 Pavia, Italy
Corresponding
E-mail address:

Abstract

During systematic characterization of amphiboles that still lack a complete mineral description, fluoro-tremolite was identified in a specimen from the Limecrest-Southdown quarry, Sparta, New Jersey, USA, which was provided by the Franklin Mineral Museum. The ideal formula of fluoro-tremolite is ABCa2 CMg5TSi8O22WF2 and the empirical formula derived for the holotype specimen, based on the results of electron-microprobe analysis and single-crystal structure refinement, is A(Na0.28K0.02)Σ0.30 B(Ca1.99Na0.01)Σ2.00C(Mg4.70 ${\rm Fe}_{{\rm 0}{\rm. 28}}^{{\rm 2 +}} $ Zn0.01 ${\rm Ti}_{{\rm 0}{\rm. 01}}^{{\rm 4 +}} $ )Σ5.00 T(Si7.68Al0.32)Σ8.00O22 W(F1.16OH0.84)Σ2.00. The unit-cell dimensions in space group C2/m are a = 9.846(2), b = 18.050(3), c = 5.2769(14) Å, β = 104.80(2)° and V = 906.7 (3) Å3 and Z = 2; the a:b:c ratio is 0.545:1:0.292. Fluoro-tremolite is biaxial (+), with α = 1.5987(5), β = 1.6102(5), γ = 1.6257(5), 2V(meas.) = 85(1)o and 2V(calc.) = 82o. The strongest ten reflections in the powder X-ray pattern [d values (in Å), I, (hkl)] are: 2.706, 100, (151); 3.126, 67, (310); 2.531, 59, ( $\bar 2$ 02); 3.381, 57, (131); 2.940, 43, ( $\bar 1$ 51, 221); 3.276, 37, (240); 2.337, 36, ( $\bar 3$ 51); 2.592, 35, (061); 2.731, 34, ( $\bar 3$ 31); 2.163, 34, (261). Both the mineral and the mineral name have been approved by the Commission on New Minerals, Nomenclature and Classification of the International Mineralogical Association (IMA2016–018); the holotype has been deposited at the Franklin Mineral Museum (32 Evans Street, Franklin, 07416 New Jersey, US), under the catalogue number 7710.

Comparison with new data on tremolite and synthetic fluoro-tremolite provides a more sound crystal-chemical model of the end-member compositions and their solid-solution.

Type
Article
Copyright
Copyright © Mineralogical Society of Great Britain and Ireland 2018 

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Footnotes

Associate Editor: Sergey Krivovichev

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Fluoro-tremolite from the Limecrest-Southdown quarry, Sparta, New Jersey, USA: crystal chemistry of a newly approved end-member of the amphibole supergroup
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