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Keywords = Muong Nong

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26 pages, 13763 KiB  
Review
57Fe Mössbauer Analysis of Meteorites and Tektites
by Benilde F. O. Costa, Eduardo Ivo Alves, Pedro A. O. C. Silva and António C. Batista
Minerals 2021, 11(6), 628; https://doi.org/10.3390/min11060628 - 12 Jun 2021
Cited by 4 | Viewed by 4239
Abstract
This review presents studies on iron meteorites (Campo del Cielo fall and an unregistered iron meteorite), an unregistered stony meteorite from Northwest Africa, and 13 tektites from the American, European, and Australasian strewn fields. The main experimental technique used in the studies was [...] Read more.
This review presents studies on iron meteorites (Campo del Cielo fall and an unregistered iron meteorite), an unregistered stony meteorite from Northwest Africa, and 13 tektites from the American, European, and Australasian strewn fields. The main experimental technique used in the studies was Mössbauer spectroscopy, both in transmission and backscattering geometries. For the latter, a MIMOS II spectrometer was used. Additionally, optical and scanning electron microscopies and X-ray diffraction were used. In the studied iron meteorites, kamacite is found as the main mineral. Campo del Cielo meteorite exhibits Widmanstätten patterns and schreibersite inclusions. The unregistered iron meteorite has Neumann lines and schreibersite inclusions. We have assigned Campo del Cielo as an octahedrite and the unregistered iron meteorite as a hexahedrite. The unregistered stony meteorite is composed mainly of iron-free silicates; at 4.2 K, the spectrum indicates maghemite and 1% troilite. The Cambodian tektite appeared individualized from other australasites, unlike the moldavite, which tends to cluster with them. Our analyses do not allow dismissing doubts on the provenance of tibetanites. The Fe3+/Fe2+ ratio was found to be higher for Muong Nong-type tektites than for splash-form tektites, as expected from their morphology and solidification from melt at lower temperature. Full article
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18 pages, 729 KiB  
Article
Quantitative Study of Porosity and Pore Features in Moldavites by Means of X-ray Micro-CT
by Giovanni Pratesi, Stefano Caporali, Francesca Loglio, Gabriele Giuli, Lenka Dziková and Roman Skála
Materials 2014, 7(4), 3319-3336; https://doi.org/10.3390/ma7043319 - 24 Apr 2014
Cited by 6 | Viewed by 6735
Abstract
X-ray micro-computer aided tomography (μ-CT), together with optical microscopy and imaging, have been applied to the study of six moldavite samples. These techniques enabled a complete characterization to be made of the textural features of both Muong Nong-type and common splashform moldavites. A [...] Read more.
X-ray micro-computer aided tomography (μ-CT), together with optical microscopy and imaging, have been applied to the study of six moldavite samples. These techniques enabled a complete characterization to be made of the textural features of both Muong Nong-type and common splashform moldavites. A detailed study of the size and distribution of pores or bubbles confirmed the marked variability in pore size among the samples, as well as within each sample, and indicated in the Muong Nong-type moldavites the presence of at least two deformation stages which occurred before and after pore formation. Full article
(This article belongs to the Section Porous Materials)
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