Results 31 to 40 of about 1,115 (180)

Ferrimagnetic Structure of 3C Pyrrhotite (Fe7S8) From Neutron Diffraction

Geochemistry, Geophysics, Geosystems
Pyrrhotite is a paleomagnetically important magnetic mineral in many geological settings. It forms numerous polytypes with different stacking patterns of the NiAs structure along the crystallographic c axis to produce different vacancy‐ordered ...
Chin‐Wei Wang, Chorng‐Shern Horng, Andrew P. Roberts   +2 more
doaj   +1 more source

Application of In-situ Micro-XRF Spectrometry in the Identification of Copper Minerals

Yankuang ceshi, 2015
There are many types of copper minerals with different occurrences and complex compositions. The paragenesis and associated minerals make it difficult to traditionally identify the rock and mineral.
LIANG Shu-ting, LIU Yu-chun, LIU Zhen, LIN Qing-wen, LIU Zhi-wei   +4 more
doaj   +1 more source

Fully Compensated Ferrimagnetic Properties of (Cr,Fe)S Compound with a Pyrrhotite‐Type Structure

Small, EarlyView.
Pyrrhotite‐type crystal structure of (Cr,Fe)S compound. The fabrication conditions for obtaining a single phase of the non‐equilibrium phase were optimized. The temperature dependence of the magnetization exhibits the typical behavior of compensated ferrimagnetism. A large magnetic coercivity of the (Cr,Fe)S compound.
Weida Yin, Masato Miyakawa, Satoshi Semboshi, Noriharu Yodoshi, Akira Masago, Yosuke Kawahito, Tetsuya Fukushima, Hisazumi Akai, Rie Y. Umetsu   +8 more
wiley   +1 more source

Microstructural evidence for multiple generations of sulfide precipitation and impact‐induced thermal alteration under acidic conditions on Asteroid Ryugu

Meteoritics &Planetary Science, EarlyView.
Abstract Here we report on the microstructure and chemistry of sulfide minerals returned from asteroid (162173) Ryugu. We identify a unique sulfide population in particle A0016 composed of violarite (FeNi2S4), pyrite (FeS2), chalcopyrite (CuFeS2), pyrrhotite (Fe1‐xS), and pentlandite ([Fe,Ni]9S8).
M. C. Benner, B. S. Prince, D. L. Schrader, T. J. Zega   +3 more
wiley   +1 more source

ESTIMATION OF PYRRHOTITE IN PYRITES ORE. [PDF]

Journal of the American Chemical Society, 1900
n ...
openaire   +1 more source

Nature, origin, and phosphorylation potential of the phosphorus/sulfur‐bearing nanoscale multiphasic assemblages in the CM chondrites Murchison and Murray

Meteoritics &Planetary Science, EarlyView.
Abstract Carbonaceous chondrites contain phosphorus, whose speciation and thus history remain to be investigated. Phosphorus/sulfur‐bearing assemblages have been reported in carbonaceous CM chondrites, but there is no consensus about their exact compositions and origins.
Valentine Megevand, Sylvain Bernard, Corentin Le Guillou, Roberto Conconi, François Guyot   +4 more
wiley   +1 more source

Pyrite alteration and neoformed magnetic minerals in the fault zone of the Chi‐Chi earthquake (Mw7.6, 1999): Evidence for frictional heating and co‐seismic fluids

Geochemistry, Geophysics, Geosystems, 2012
During an earthquake, physical and chemical transformations lead to alteration and formation of minerals in the gouge layer. Altered and neoformed minerals can be used as tracers of some earthquake processes.
Yu‐Min Chou, Sheng‐Rong Song, Charles Aubourg, Yen‐Fang Song, Anne‐Marie Boullier, Teh‐Quei Lee, Mark Evans, En‐Chao Yeh, Yi‐Ming Chen   +8 more
doaj   +1 more source

Assessing microstructures of pyrrhotites in basalts by multifractal analysis [PDF]

Nonlinear Processes in Geophysics, 2010
Understanding and describing spatial arrangements of mineral particles and determining the mineral distribution structure are important to model the rock-forming process.
S. Xie, Q. Cheng, S. Zhang, K. Huang
doaj   +1 more source

Magnetic Phase Relations of Pyrrhotite

Journal of geomagnetism and geoelectricity, 1972
A series of iron sulphide compositions containing between 50 and 46.0 atomic percent iron has been synthesized and the products of the syntheses annealed at 701, 350, 300 and 144°C. The charges were examined in polished sections by X-ray powder photography, electron microprobe analysis and Mossbauer spectroscopy, and the thermomagnetic properties were ...
Schwarz, E. J., Vaughan, D. J.
openaire   +3 more sources

Experimental Constraints on the Formation of Niningerite and Oldhamite Under Highly Reducing Conditions: Implications for Sulfide Formation in EH3 Chondrites

Journal of Geophysical Research: Planets, Volume 131, Issue 8, August 2026.
Abstract Enstatite chondrites record highly reducing conditions in the early solar nebula, yet the origin of their abundant sulfides remains unclear. Niningerite (MgS) and oldhamite (CaS) are ubiquitous in EH3 enstatite chondrites and distinguish them from other chondrite groups.
N. Imae
wiley   +1 more source