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Compositional variation of turquoise-group minerals from the historical collection of the Real Museo Mineralogico of the University of Naples

Published online by Cambridge University Press:  26 January 2018

Manuela Rossi ,
Rosanna Rizzi ,
Alessandro Vergara ,
Francesco Capitelli ,
Angela Altomare ,
Fabio Bellatreccia ,
Michele Saviano  and
Rosaria M. Ghiara
Manuela Rossi*
Affiliation:
Dipartimento di Scienze della Terra dell’Ambiente e delle Risorse, Università di Napoli Federico II, Largo S. Marcellino 10, 80134 Naples, Italy Centro Musei delle Scienze Naturali e Fisiche, Università di Napoli Federico II, Via Mezzocannone 8, 80134 Naples, Italy
Rosanna Rizzi
Affiliation:
Istituto di Cristallografia, CNR, Via Amendola 122/o, 70126 Bari, Italy
Alessandro Vergara
Affiliation:
Dipartimento di Scienze Chimiche, Università di Napoli Federico II, Complesso di Monte Sant’Angelo, 80126, Naples, Italy
Francesco Capitelli
Affiliation:
Istituto di Cristallografia, CNR, Via Salaria Km 29.300, 00016 Monterotondo, RomeItaly
Angela Altomare
Affiliation:
Istituto di Cristallografia, CNR, Via Amendola 122/o, 70126 Bari, Italy
Fabio Bellatreccia
Affiliation:
Dipartimento di Scienze, Università di Roma 3, Largo S. Leonardo Murialdo 1, 000146, Rome, Italy
Michele Saviano
Affiliation:
Istituto di Cristallografia, CNR, Via Amendola 122/o, 70126 Bari, Italy
Rosaria M. Ghiara
Affiliation:
Dipartimento di Scienze della Terra dell’Ambiente e delle Risorse, Università di Napoli Federico II, Largo S. Marcellino 10, 80134 Naples, Italy Centro Musei delle Scienze Naturali e Fisiche, Università di Napoli Federico II, Via Mezzocannone 8, 80134 Naples, Italy
*
* E-mail: [email protected]
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Abstract

Five turquoise samples, belonging to the XVII century historical collection of the Real Museo Mineralogico (University of Naples Federico II), were investigated by a multi-methodological approach based on powder X-ray diffraction, electron microprobe analysis in wavelength-dispersive spectroscopy mode, backscattered electron images from scanning electron microscopy in energy-dispersive spectroscopy mode, laser ablation inductively coupled plasma mass spectrometry, Fourier transform infrared and Raman spectroscopy.

The samples originate from Sinai (Egypt), Santa Fè S. Miguel (New Mexico), Saxony (Germany), Montebras Creuse (France) and Nishapur (Khorassan, Iran) and display different mineralogical compositions and various mineral associations. The study has shown the presence of: (1) four minerals of the turquoise group: turquoise, faustite, chalcosiderite and planerite; (2) other phosphates from different groups: wavellite, crandallite, goyazite, gorceixite, variscite, metavariscite, fluorapatite; and (3) other minerals: voltaite, adularia and quartz.

The present investigation is intended to show the mineralogical and geochemical variability of the samples with particular attention to the mineralogical parageneses, textural analyses and trace-element concentrations.

Keywords

turquoise-group mineralsalterationelectron microprobe analysispowder X-ray diffractionQualX2.0FTIRRaman
Type
Research Article
Information
Mineralogical Magazine , Volume 81 , Issue 6 , December 2017 , pp. 1405 - 1429
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2017

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