Jervisite, NaScSi2O6: Optical data, morphology, Raman spectroscopy, and crystal chemistry

Baveno; Crystal structure; Electron microprobe; Gladstone-Dale index; Italy; Jervisite; Raman spectroscopy; Single-crystal X-ray diffraction; Crystal chemistry; Morphology; Refractive index; Silicate minerals; Single crystals; Electron microprobes; Single crystal x-ray diffraction

Abstract :

[en] The crystal structure of jervisite, ideally NaScSi2O6, was refined using single-crystal X-ray data collected using a crystal from the Seula quarry (Baveno, Verbano-Cusio-Ossola province, Italy). The refinement was carried out in the C2/c space group giving the following unit-cell dimensions: a ¼ 9.8478(2) Å, b ¼ 9.0575(1) Å, c ¼ 5.3409(3) Å, b ¼ 106.87(2)8, and V ¼ 455.89(2) Å3for Z ¼ 4. The previous crystal structure, refined using data from a synthetic analogue and a natural sample, was confirmed and conforms with that of aegirine. The bond-valence calculation and the refined occupancy of the M1 and M2 sites confirm the cation distribution adopted in the empirical formula. Raman spectroscopy and refractive index measurements were also performed, and the morphology was studied in order to provide a complete description of this Sc-bearing Na pyroxene. © 2019 Mineralogical Association of Canada. All rights reserved.

Disciplines :

Earth sciences & physical geography

Author, co-author :

Vignola, P.; CNR-Istituto per la dinamica dei processi ambientali, via Mario Bianco, 9, Milano, I-20131, Italy

Rotiroti, N.; Dipartimento di Scienze della Terra, Università degli Studi di Milano, via Botticelli 23, Milano, I-20133, Italy

Hatert, Frédéric ; Université de Liège - ULiège > Département de géologie > Minéralogie et cristallochimie

Bersani, D.; Dipartimento di Scienze Matematiche, Fisiche e Informatiche, Università di Parma, Parco Area della Scienza 7/a, Parma, 43124, Italy

Andò, S.; Dipartimento di Scienze dell’Ambiente e della Terra (DISAT), Università di Milano-Bicocca, Piazzale della Scienza 4, Milano, 20126, Italy

Varvello, S.; Vai De Vit 17, Stresa, 28838, Italy

Language :

English

Title :

Jervisite, NaScSi2O6: Optical data, morphology, Raman spectroscopy, and crystal chemistry

Publication date :

2019

Journal title :

Canadian Mineralogist

ISSN :

0008-4476

eISSN :

1499-1276

Publisher :

Mineralogical Association of Canada

Volume :

Issue :

Pages :

489-498

Peer reviewed :

Peer Reviewed verified by ORBi

Available on ORBi :

since 09 March 2020

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