Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience
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Iron biomineralization in magnetotactic bacteria

Iron biomineralization in magnetotactic bacteria | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
Ath Godelitsas's insight:

Magnetotactic bacteria align along the Earth’s magnetic field using an organelle called the magnetosome, a biomineralized magnetite (Fe(ii)Fe(iii)2O4) or greigite (Fe(ii)Fe(iii)2S4) crystal embedded in a lipid vesicle. Mutational analysis, enzyme kinetics, co-crystallization with iron(ii) and an in vitro MamP-assisted magnetite production assay establish MamP as an iron oxidase that contributes to the formation of iron(iii) ferrihydrite eventually required for magnetite crystal growth in vivo.

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Vanadium: the ‘beautiful metal’ that stores energy

Vanadium: the ‘beautiful metal’ that stores energy | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
An unheralded metal could become a crucial part of the renewables
revolution. Vanadium is used in new batteries which can store large amounts
of energy almost indefinitely, perfect for remote wind or solar farms.
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Diamond nucleation via magnetite in the Earth's mantle

Diamond nucleation via magnetite in the Earth's mantle | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
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The authors provide with direct evidence for the formation of diamond by redox reactions involving FeNi sulfides.
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A new type of solar-system material recovered from Ordovician marine limestone

A new type of solar-system material recovered from Ordovician marine limestone | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
This may be the first documented example of an ‘extinct’ meteorite, that is, a meteorite type that does not fall on Earth today because its parent body has been consumed by collisions.
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High concentrations of manganese and sulfur in deposits on Murray Ridge, Endeavour Crater, Mars

High concentrations of manganese and sulfur in deposits on Murray Ridge, Endeavour Crater, Mars | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
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Ath Godelitsas's insight:
Opportunity’s rover wheels serendipitously excavated and overturned several small rocks from a Cook Haven fracture zone. Extensive measurement campaigns were conducted on two of them: Pinnacle Island and Stuart Island. These rocks have the highest concentrations of Mn and S measured to date by Opportunity and occur as a relatively bright sulfate-rich coating on basaltic rock, capped by a thin deposit of one or more dark Mn oxide phases intermixed with sulfate minerals.
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Late-stage volatile saturation as a potential trigger for explosive volcanic eruptions

Late-stage volatile saturation as a potential trigger for explosive volcanic eruptions | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
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Ath Godelitsas's insight:
The authors have analysed fluorine, chlorine and water in apatite crystals trapped at different stages of magma evolution, and in melt inclusions from clinopyroxene and biotite crystals expelled during an explosive eruption of the Campi Flegrei caldera, Italy, about 4,000 years ago.
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Water Structure and Dynamics in Smectites

Water Structure and Dynamics in Smectites | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
Variable-temperature X-ray diffraction and 2H NMR spectroscopy of the smectite mineral, hectorite, containing interlayer Na+, K+, Cs+, Mg2+, Ca2+, Sr2+, and Pb2+ equilibrated at 43% relative humidity (RH) and mixed with 2H2O to form a paste provide a comprehensive picture of the structural environments and dynamics of interlayer 2H2O and the relationships of these properties to interlayer hydration state, the hydration energy and polarizability of the cation, temperature, and the formation of ice-1h in the interparticle pores.
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Mapping of Nanoinclusions in Milky Diamonds from Juina, Brazil

Mapping of Nanoinclusions in Milky Diamonds from Juina, Brazil | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
The investigation of these specific diamonds may open a new window to deeper parts of the Earth (>660 km) as they represent pristine material of this deep mantle environment.
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Plan to Turn Asteroids Into Spaceships Could Spur Off-Earth Mining

Plan to Turn Asteroids Into Spaceships Could Spur Off-Earth Mining | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
California-based company Made In Space is investigating how to turn asteroids into giant autonomous spacecraft, as part of a long-term plan to enable space colonization by helping make off-Earth manufacturing economically viable.
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Sorption of strontium and cobalt onto biogenic hydroxyapatite

Sorption of strontium and cobalt onto biogenic hydroxyapatite | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
The sorption capacity of the BHAP for both Sr2+ and Co2+ was higher than for a synthetically produced hydroxyapatite (HAP) in the solutions tested.
Ath Godelitsas's insight:
The sorption capacity of the BHAP for both Sr2+ and Co2+ was higher than for a synthetically produced hydroxyapatite (HAP) in the solutions tested.
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Reassessment of 90Sr, 137Cs, and 134Cs in the Coast off Japan Derived from the Fukushima Dai-ichi Nuclear Accident

Reassessment of 90Sr, 137Cs, and 134Cs in the Coast off Japan Derived from the Fukushima Dai-ichi Nuclear Accident | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
Ath Godelitsas's insight:
These results strongly suggest that a continuous surveillance of artificial radionuclides in the Pacific Ocean is still required.
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Lingunite-a high-pressure plagioclase polymorph at mineral interfaces in doleritic rock of the Lockne impact structure (Sweden)

Lingunite-a high-pressure plagioclase polymorph at mineral interfaces in doleritic rock of the Lockne impact structure (Sweden) | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
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The occurrence of lingunite suggests that the local pressure was above 19 GPa and the local temperature overwhelmed 1000 °C.
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ICGMP Copenhagen 2016: 18th International Conference on Geochemistry, Mineralogy and Petrology

ICGMP Copenhagen 2016: 18th International Conference on Geochemistry, Mineralogy and Petrology | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
International Conference on Geochemistry, Minerology and Petrology, ICGMP Copenhagen 2016
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GeoMet2016 - Workshops and Tours

GeoMet2016 - Workshops and Tours | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
Don't forget to register for our workshop on "Introduction to Operational Mineralogy" on June 17 at #Geomet16. https://t.co/rrun1UbYNY
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Nanomineralogy as a new dimension in understanding elusive geochemical processes in soils

Nanomineralogy as a new dimension in understanding elusive geochemical processes in soils | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
Ath Godelitsas's insight:
Complex assemblages of nanophases formed prior to the second generation of clay minerals depict underlying mechanisms for the mobilization and sequestration of the low-solubility-index elements Zr and Ti under acidic conditions. The occurrence of baddeleyite (ZrO2), anatase (TiO2), and the Magneli phases Ti4O7 and Ti5O9 (all present at the nanoscale) suggest an influx of nanocolloidal Zr and Ti oxides during weathering of smelter-derived particulate matter.
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Molecular preservation of 1.88 Ga organic microfossils as a function of temperature and mineralogy

Molecular preservation of 1.88 Ga organic microfossils as a function of temperature and mineralogy | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
Ath Godelitsas's insight:
Synchrotron-based XANES data collected in situ on individual microfossils, at the submicrometre scale, are compared with data collected on modern microorganisms. Despite diagenetic temperatures of ~150–170 °C deduced from Raman data, the molecular signatures of some Gunflint organic microfossils have been exceptionally well preserved. Remarkably, amide groups derived from protein compounds can still be detected.
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FeO2 and FeOOH under deep lower-mantle conditions and Earth’s oxygen–hydrogen cycles

FeO2 and FeOOH under deep lower-mantle conditions and Earth’s oxygen–hydrogen cycles | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
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Ath Godelitsas's insight:
The authors used first-principles calculations and experiments to identify a highly stable, pyrite-structured iron oxide (FeO2) at 76 gigapascals and 1,800 kelvin that holds an excessive amount of oxygen. We show that the mineral goethite, FeOOH, which exists ubiquitously as ‘rust’ and is concentrated in bog iron ore, decomposes under the deep lower-mantle conditions to form FeO2 and release H2. The reaction could cause accumulation of the heavy FeO2-bearing patches in the deep lower mantle, upward migration of hydrogen, and separation of the oxygen and hydrogen cycles.
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Constraints on the solid solubility of Hg, Tl, and Cd in arsenian pyrite

Constraints on the solid solubility of Hg, Tl, and Cd in arsenian pyrite | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it

Arsenic-rich (arsenian) pyrite can contain up to tens of thousands of parts per million (ppm) of toxic heavy metals such as Hg, Tl, and Cd, although few data are available on their solid solubility behavior. When a compilation of Hg, Tl, and Cd analyses from different environments are plotted along with As in a M(Hg, Tl, and Cd)-As log-log space, the resulting wedge-shaped distribution of data points suggests that the solid solubility of the aforementioned metals is strongly dependent on the As concentration of pyrite.

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Rapid carbon mineralization for permanent disposal of anthropogenic carbon dioxide emissions

Rapid carbon mineralization for permanent disposal of anthropogenic carbon dioxide emissions | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
Rapid carbon mineralization for permanent disposal of anthropogenic carbon dioxide emissions
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Calcium Carbonate Mineralization in a Confined Geometry

Calcium Carbonate Mineralization in a Confined Geometry | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
Injection of CO2 in porous aquifers, where mineralization takes place via chemical reactions, is one possible long-term solution considered for storage of this greenhouse gas. This mineralization is investigated here experimentally in a confined geometry by injecting radially an aqueous solution of carbonate into a solution of calcium ions to produce solid calcium carbonate.
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Have scientists really found something harder than diamond?

Have scientists really found something harder than diamond? | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
Ask most people what the hardest material on Earth is and they will
probably answer “diamond”. Its name comes from the Greek word ἀδάμας
(adámas) meaning “unbreakable” or “invincible” and is from where we get the
word “adamant”.
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Self-Generated Electrokinetic Fluid Flows during Pseudomorphic Mineral Replacement Reactions

Self-Generated Electrokinetic Fluid Flows during Pseudomorphic Mineral Replacement Reactions | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
Ath Godelitsas's insight:
Author's observations reveal that pseudomorphic mineral replacement (pMRR) is transport-controlled for this system and that convective fluid flows, caused by diffusioosmosis, play a key role in the ion transport process across the reaction-induced pores in the product phase.
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The meteoritic origin of Tutankhamun's iron dagger blade

The meteoritic origin of Tutankhamun's iron dagger blade | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
It looks like Tutankhamen's iron dagger blade was made from a meteorite, but big question was it made in Egypt? https://t.co/8WcgI1xmqy
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Jurassic zircons from the Southwest Indian Ridge

Jurassic zircons from the Southwest Indian Ridge | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
The existence of ancient rocks in present mid-ocean ridges have long been observed but received less attention.
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Preservation of Archaeal Surface Layer Structure During Mineralization

Preservation of Archaeal Surface Layer Structure During Mineralization | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
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Using Sulfolobus acidocaldarius a hyperthermophilic archaeon native to metal-enriched environments and possessing a cell envelope composed only of a S-layer and a lipid cell membrane, the authors describe a passive process of iron phosphate nucleation and growth within the S-layer of cells and cell-free S-layer “ghosts” during incubation in a Fe-rich medium, independently of metabolic activity.
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Evidence for a changing Martian climate from the mineralogy at Mawrth Vallis

Evidence for a changing Martian climate from the mineralogy at Mawrth Vallis | Mineralogy, Geochemistry, Mineral Surfaces & Nanogeoscience | Scoop.it
EPSL. Evidence for a changing Martian climate from the mineralogy at Mawrth Vallis: Publication date: 15 Augu... https://t.co/hNmQLC7m2I
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