Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience
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Improved low-resolution crystallographic refinement with Phenix and Rosetta

Improved low-resolution crystallographic refinement with Phenix and Rosetta | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
Ath Godelitsas's insight:

X-ray crystallography of proteins yields structural images that resemble the artwork of M.C. Escher. A combination of the PHENIX and Rosetta programs can help refine these structural images, making the best of available data. See also: http://newscenter.lbl.gov/science-shorts/2013/11/04/bringing-out-the-best-in-x-ray-crystallography-data/

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Meteorites Help Answer Questions About Solar System Evolution

A team of eight scientists spent two-months in the frozen landscape of Antarctica as part of the Antarctic Search for Meteorites (ANSMET), a 40-year progra
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Asbestiform and nonasbestiform amphiboles: iron oxidation, mineral morphology, and potential health effects may all be interrelated

Asbestiform and nonasbestiform amphiboles: iron oxidation, mineral morphology, and potential health effects may all be interrelated | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
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The authors obtained oriented Fe-XANES spectra on three amphibole bundles of fiber (i.e., asbestiform morphology), two single-crystal fragments (i.e., nonasbestiform morphology), and one aggregate of thousands of smaller particles (termed herein a “puffball”) by use of a spindle stage mounted on beamline X26A, National Synchrotron Light Source, Brookhaven National Lab.
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Organophosphate Precipitation at the Calcite–Water Interface by in Situ Atomic-Force Microscopy

Organophosphate Precipitation at the Calcite–Water Interface by in Situ Atomic-Force Microscopy | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
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Ath Godelitsas's insight:
Here, by using in situ atomic-force microscopy (AFM) to visualize the dissolution of calcite (1014) faces, the authors show that the presence of G6P results in morphology changes of etch pits from the typical rhombohedral to a fan-shaped form.
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Behavior of the Chemical Potential in Calcite and Magnesite Crystals

Behavior of the Chemical Potential in Calcite and Magnesite Crystals | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
The behavior of the chemical potential of the species CaCO3 and MgCO3 in proximity of the (10.4) crystal face of calcite and magnesite is determined at the quantum–mechanical level by adopting a recent calculation strategy conceived in our research laboratory. A very peculiar trend of this quantity from the (10.4) surface to the center of the calcite and magnesite crystals was observed.
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Most diamonds were created equal

Most diamonds were created equal | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
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The authors examined 30 gemmy twinned diamonds with evolved nitrogen aggregation (high B/(A+B)B/(A+B) ratio).
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European Journal of Mineralogy - Special Issue in honour of Prof. Th. Armbruster @unibern

European Journal of Mineralogy - Special Issue in honour of Prof. Th. Armbruster @unibern | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
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Carbon mineral ecology: Predicting the undiscovered minerals of carbon

Carbon mineral ecology: Predicting the undiscovered minerals of carbon | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
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135Cs activity and 135Cs/137Cs atom ratio in environmental samples before and after the Fukushima Daiichi Nuclear Power Plant accident

135Cs activity and 135Cs/137Cs atom ratio in environmental samples before and after the Fukushima Daiichi Nuclear Power Plant accident | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
135Cs/137Cs is a potential tracer for radiocesium source identification. However, due to the challenge to measure 135Cs, there were no 135Cs data available for Japanese environmental samples before the Fukushima Daiichi Nuclear Power Plant (FDNPP) accident.
Ath Godelitsas's insight:
According to recent studies, the total atmospheric released amounts of 134Cs, 135Cs, 136Cs, and 137Cs from the FDNPP accident were estimated to be 11.8–18, 6.74 × 10−5, 2.2–2.6, and 13–36 PBq, respectively.
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Surreal digital collages combine cuttings from vintage magazines with mineralogy

Surreal digital collages combine cuttings from vintage magazines with mineralogy | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
In her series of striking collages, Istanbul-based illustrator [Ceren Kilic](http://www.cerenkilic.net/) uses mixed media to create other-worldl
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Climate Catastrophe, Coming Even Sooner? - The New Yorker

Climate Catastrophe, Coming Even Sooner? - The New Yorker | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
Elizabeth Kolbert on the possibility of a rapid Antarctic ice-sheet collapse due to global warming, and on denialism among Republican politicians.
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Sirius - The new Brazilian synchrotron light source

The Brazilian Synchrotron Light Laboratory (LNLS) is currently engaged in the construction of Sirius, the next Brazilian synchrotron light source. It i
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Formation of calcium sulfate through the aggregation of sub-3 nanometre primary species

Formation of calcium sulfate through the aggregation of sub-3 nanometre primary species | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
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Ath Godelitsas's insight:
The formation pathways of gypsum remain uncertain. Here, using truly in situ and fast time-resolved small-angle X-ray scattering, the authors quantify the four-stage solution-based nucleation and growth of gypsum (CaSO4·2H2O), an important mineral phase on Earth and Mars.
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Kinetic Monte Carlo Approach To Study Carbonate Dissolution

Kinetic Monte Carlo Approach To Study Carbonate Dissolution | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
Ath Godelitsas's insight:
In this work the authors employ the Kinetic Monte Carlo (KMC) approach to model carbonate dissolution at the nanometer–micron scale range and to access quantitative relationships between the variety of surface reactive sites and experimentally observed spatiotemporal rate variance.
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Mechanisms of chromate adsorption on boehmite

Mechanisms of chromate adsorption on boehmite | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
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In this study, the authors characterized the mechanisms of chromate adsorption on boehmite (γ-AlOOH) using a combination of extended X-ray absorption fine structure (EXAFS) measurements, in situ attenuated total reflectance Fourier transform infrared spectroscopy, and quantum chemical calculations.
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#Asbestos reactivity is dependent on iron surface topochemistry and
nuclearity

#Asbestos reactivity is dependent on iron surface topochemistry and<br/>nuclearity | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
• New surface reactivity results on tremolite asbestos by XPS, HR-TEM and ICP-AES
• Surface morphology and composition change upon time after incubation at pH 7.4.
• Presence of nano-clustered iron explains the high reactivity of these asbestos.
• Low amounts of iron act as catalyzer of the ROS production.
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Direct Nanoscale Imaging Reveals the Growth of Calcite Crystals via Amorphous Nanoparticles

Direct Nanoscale Imaging Reveals the Growth of Calcite Crystals via Amorphous Nanoparticles | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
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Ath Godelitsas's insight:
The authors show, using in situ atomic force microscopy and complementary techniques, that faceted calcite can grow via a nonclassical particle-mediated colloidal crystal growth mechanism that at the nanoscale mirrors classical ion-mediated growth, and involves a layer-by-layer attachment of amorphous calcium carbonate (ACC) nanoparticles, followed by their restructuring and fusion with the calcite substrate in perfect crystallographic registry. The ACC-to-calcite transformation occurs by an interface-coupled dissolution–reprecipitation mechanism and obliterates or preserves the nanogranular texture of the colloidal growth layer in the absence or presence of organic (macro)molecules, respectively.
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Hydrothermal atomic force microscopy observations of barite step growth rates as a function of the aqueous barium-to-sulfate ratio

Hydrothermal atomic force microscopy observations of barite step growth rates as a function of the aqueous barium-to-sulfate ratio | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
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Replacement of barite by a (Ba,Ra)SO4 solid solution at close-to-equilibrium conditions

Replacement of barite by a (Ba,Ra)SO4 solid solution at close-to-equilibrium conditions | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
Solid solution formation between RaSO4 and BaSO4 has long been recognized as a process which potentially controls the Ra concentration in the environment.
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Radiation damage in biotite mica by accelerated α-particles

Radiation damage in biotite mica by accelerated α-particles | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
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The α-radiation stability of biotite mica [general formula: K(Mg,Fe)3(Al,Si3O10)(F,OH)2] has been investigated using the 5 MV tandem pelletron at the University of Manchester’s Dalton Cumbrian Facility (DCF) and both the microfocus spectroscopy (I18) and core X-ray absorption spectroscopy (B18) beamlines at Diamond Light Source (U.K.).
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Mercury anomalies and the timing of biotic recovery following the end-Triassic mass extinction

Mercury anomalies and the timing of biotic recovery following the end-Triassic mass extinction | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
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Stanford scientists improve perovskite solar-cell absorbers by giving them a squeeze

Stanford scientists improve perovskite solar-cell absorbers by giving them a squeeze | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
Adding pressure could improve the performance of solar cells made of perovskites, a promising photovoltaic material.
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EU-Training network MicroArctic initiated - Research in Germany

EU-Training network MicroArctic initiated - Research in Germany | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
On 1 April the international training and research programme for junior scientists MicroArctic „Microorganisms in Warming Arctic Environments” is initiated.
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Extreme Environments Laboratory | Stanford University

Extreme Environments Laboratory | Stanford University | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
Stanford Earth scientists work to gain a better understanding of our planet's history and future, energy and resources, geologic hazards, and changing climate.
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The Science and Supply of America's Critical Minerals and Materials

This Critical Issues webinar is based on a Congressional briefing organized by AGI on behalf of the Mineral Science & Information Coalition (3 March 2016)
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Biogenic Sulfur Compounds from the Ocean to the Atmosphere

Biogenic Sulfur Compounds from the Ocean to the Atmosphere | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
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The authors present measurements of ocean-derived particles containing reduced sulfur, detected as elemental sulfur ions (e.g., 32S+, 64S2+), in seven different marine environments using real-time, single particle mass spectrometry; these particles have not been detected outside of the marine environment.
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