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Fluoronyböite from Jianchang (Su-Lu, China) and nyböite from Nybö (Nordfjord, Norway): a petrological and crystal-chemical comparison of these two high-pressure amphiboles

Published online by Cambridge University Press:  05 July 2018

R. Oberti ,
M. Boiocchi  and
D. C. Smith
R. Oberti*
Affiliation:
CNR-Istituto di Geoscienze e Georisorse, sezione di Pavia, I-27100 Pavia, Italy
M. Boiocchi
Affiliation:
Centro Grandi Strumenti, Università degli Studi di Pavia, I-27100 Pavia, Italy
D. C. Smith
Affiliation:
Muséum National d’Histoire Naturelle, Bâtiment Minéralogie, F-75005 Paris, France
*
* E-mail: [email protected]
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Abstract

Fluoronyböite, ideally NaNa2(Al2Mg3)(Si7Al)O22F2, has been found in the Jianchang eclogite pod, Su-Lu coesite-eclogite province, China. It has been approved as a new mineral by the IMA. Single-crystal structure refinement and electron microprobe analysis were used for characterization: C2/m, with a = 9.666(4), b = 17.799(6), c = 5.311(2) Å, β = 104.10(3)º, V = 886.2(8) Å3, Z = 2, formula: A(Na0.78K0.06)Σ0.84B(Na1.53Ca0.47)Σ2.00C(Fe2+0.89Mg2.55Mn0.01Zn0.01Fe3+0.32Al1.21Ti0.01)Σ5.00T(Si7.14Al0.86)Σ8.00O22X(OH0.84F1.16)Σ2.00.

Fluoronyböite formed during UHPM conditions, and is preserved in the retrograded kyanite-bearing eclogite sample DJ102 together with clinopyroxene (Jd70Ae20Di10), garnet (Alm60Prp21Grs17Sps02), and rutile. Lower-pressure minerals are also present (fluoro-alumino-magnesiotaramite, apatite, paragonite), and symplectitic rims were also developed around clinopyroxene crystals. Cation ordering and the structural and physical properties of fluoronyböite are reported and discussed with reference to those of F-free nyböite from the type locality at Nyböin Norway, for which some as yet unpublished mineral data are also reported. Relations between composition and petrogenetic conditions of these rare high-pressure amphiboles are discussed.

Keywords

fluoronyböite, nyböite, amphibole, structure refinement, UHPM metamorphism.
Type
Research Article
Information
Mineralogical Magazine , Volume 67 , Issue 4 , August 2003 , pp. 769 - 782
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2003

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