Intracrystalline microstructure of Monte Fico lizardite, by optics, μ-Raman spectroscopy and TEM

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Marco E. Ciriotti
Messaggi: 28437
Iscritto il: ven 25 giu, 2004 11:31
Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
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Intracrystalline microstructure of Monte Fico lizardite, by optics, μ-Raman spectroscopy and TEM

Messaggio da Marco E. Ciriotti » lun 02 ago, 2021 11:22

Referenza:
▪ Capitani, G., Compagnoni, R., Cossio, R., Botta, S., Mellini, M. (2021): The intracrystalline microstructure of Monte Fico lizardite, by optics, μ -Raman spectroscopy and TEM. European Journal of Mineralogy, 33, 425-432.

Abstract:
The Monte Fico lizardite crystals have an internal skeletal spongy microstructure, formed by two micrometric domains having different optical reliefs. This intracrystalline microstructure parallels the previously reported intercrystalline arrangement, consisting of lizardite prisms within a chrysotile plus polygonal serpentine matrix. In the high-wavenumber region, the larger and more abundant domains (that represent approximately 87 % of the total field view) produce μ-Raman spectra characterized by two major peaks at 3686 and 3705 cm−1. The smaller, less abundant domains present a wide band confined between these wavenumbers. These features are interpreted as lizardite and chrysotile, respectively. Raman results are confirmed by TEM, which emphasizes the presence of well-recognizable polygonal serpentine too. Tight crystallographic control exists between lizardite and this first serpentine generation. A second serpentine generation occurs perpendicularly to the first one. The lizardite crystals grew up with a skeletal habit, whereas chrysotile fibres and polygonal serpentine filled the voids, growing epitactically on the lizardite crystals, with fast crystal growth in a fluid-rich environment.
Marco E. Ciriotti

«Things are interesting only in so far as they relate themselves to other things»

VINCENZO MILETTO
Messaggi: 607
Iscritto il: mer 31 gen, 2007 16:44
Località: Cavour - Torino

Re: Intracrystalline microstructure of Monte Fico lizardite, by optics, μ-Raman spectroscopy and TEM

Messaggio da VINCENZO MILETTO » lun 02 ago, 2021 15:37

Potrebbe anche essere interessante studiare la lizardite delle miniere di Brosso ed eventuali pseudomorfosi, come descritto nel libro "Minerali del Piemonte e della Valle d'Aosta", nell'articolo di Antonello Barresi a pag. 477.
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