Y. A. Abdu
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View article: Cummingtonite-(<i>P</i>2<sub>1</sub>/<i>m</i>): Crystal-structure refinement, Mössbauer spectroscopy and infrared spectroscopy, and some aspects of classification of the magnesium-iron-manganese amphiboles
Cummingtonite-(<i>P</i>2<sub>1</sub>/<i>m</i>): Crystal-structure refinement, Mössbauer spectroscopy and infrared spectroscopy, and some aspects of classification of the magnesium-iron-manganese amphiboles Open
The crystal structure of cummingtonite-( P 2 1 / m ) was characterised by single-crystal structure-refinement, infrared spectroscopy and 57 Fe Mössbauer spectroscopy. Previous cummingtonite-( P 2 1 / m ) specimens characterised have Mn 2+ …
View article: Uvite, CaMg<sub>3</sub>(Al<sub>5</sub>Mg)(Si<sub>6</sub>O<sub>18</sub>)(BO<sub>3</sub>)<sub>3</sub>(OH)<sub>3</sub>(OH), a new, but long-anticipated mineral species of the tourmaline supergroup from San Piero in Campo, Elba Island, Italy
Uvite, CaMg<sub>3</sub>(Al<sub>5</sub>Mg)(Si<sub>6</sub>O<sub>18</sub>)(BO<sub>3</sub>)<sub>3</sub>(OH)<sub>3</sub>(OH), a new, but long-anticipated mineral species of the tourmaline supergroup from San Piero in Campo, Elba Island, Italy Open
Uvite, CaMg 3 (Al 5 Mg)(Si 6 O 18 )(BO 3 ) 3 (OH) 3 (OH), is a new mineral of the tourmaline supergroup. It occurs in the Facciatoia quarry, San Piero in Campo, Elba Island, Italy (42°45′04.55″N, 10°12′50.89″E) at the centre of a narrow (2…
View article: Chemically synthesized nanoparticles of iron and iron-carbides
Chemically synthesized nanoparticles of iron and iron-carbides Open
In this paper, we report a one-pot chemical synthesis for the preparation of iron and iron-carbide nanoparticles.
View article: Near-infrared spectroscopy of Ca-rich clinopyroxenes revisited: A new interpretation of anomalous type-B spectra and implications for remote sensing of inner solar system bodies
Near-infrared spectroscopy of Ca-rich clinopyroxenes revisited: A new interpretation of anomalous type-B spectra and implications for remote sensing of inner solar system bodies Open
Four Ca-rich clinopyroxene samples (3 terrestrial clinopyroxenes and a druse clinopyroxene from the D’Orbigny meteorite) have been studied by near-infrared (NIR) spectroscopy and X-ray structure refinement in order to address the issue of …
View article: Infrared Spectroscopy of Carbonaceous-chondrite Inclusions in the Kapoeta Meteorite: Discovery of Nanodiamonds with New Spectral Features and Astrophysical Implications
Infrared Spectroscopy of Carbonaceous-chondrite Inclusions in the Kapoeta Meteorite: Discovery of Nanodiamonds with New Spectral Features and Astrophysical Implications Open
We report the finding of nanodiamonds, coexisting with amorphous carbon, in carbonaceous-chondrite (CC) material from the Kapoeta achondritic meteorite by Fourier-transform infrared (FTIR) spectroscopy and micro-Raman spectroscopy. In the …
View article: Mössbauer spectroscopy of pyroxene in the light-dark structure of the Kapoeta meteorite: implications for thermal history of the Kapoeta parent body
Mössbauer spectroscopy of pyroxene in the light-dark structure of the Kapoeta meteorite: implications for thermal history of the Kapoeta parent body Open
We report an experimental study of the intracrystalline distribution of Fe2+ and Mg between the non-equivalent octahedral sites, M1 and M2, in orthopyroxene from the Kapoeta meteorite by single-crystal X-ray diffraction and Mössbauer spect…
View article: Fogoite-(Y), Na<sub>3</sub>Ca<sub>2</sub>Y<sub>2</sub>Ti(Si<sub>2</sub>O<sub>7</sub>)<sub>2</sub>OF<sub>3</sub>, a Group I TS-block mineral from the Lagoa do Fogo, the Fogo volcano, São Miguel Island, the Azores: Description and crystal structure
Fogoite-(Y), Na<sub>3</sub>Ca<sub>2</sub>Y<sub>2</sub>Ti(Si<sub>2</sub>O<sub>7</sub>)<sub>2</sub>OF<sub>3</sub>, a Group I TS-block mineral from the Lagoa do Fogo, the Fogo volcano, São Miguel Island, the Azores: Description and crystal structure Open
Fogoite-(Y), Na 3 Ca 2 Y 2 Ti(Si 2 O 7 ) 2 OF 3 , is a new mineral from the Lagoa do Fogo, São Miguel Island, the Azores. It occurs in cavities as highly elongated (on [001]) prisms, up to 2000 μm long and 50 μm× 50 μm in cross-section, as…