Results 41 to 50 of about 595 (174)

Bismuth-nickel mineralization in chromitites of Mariinskii deposit (Urals emerald mines)

Литосфера, 2018
The unusual Bi-Ni mineralization, represented by parkerite, millerite, bismutohauchecornite, bismuthinite, nickeline and, possibly nickel analogue of smythite (?), found in the metasomatically altered chromite rocks of the Mariinsky emerald-beryllium ...
Mikhail P. Popov, Yurii V. Erokhin, Vera V. Khiller   +2 more
doaj   +2 more sources

The Structure of Spinels: A Quantitative Assessment of the AB2X4 Family

Journal of the American Ceramic Society, Volume 109, Issue 8, August 2026.
ABSTRACT Compounds with the general formula AB2X4 crystallize with the atomic structure of the mineral spinel, MgAl2O4, described by three degrees of freedom: lattice parameter a, anion parameter u, and cation inversion parameter λ. Here, bond valence sum validation of 1244 ambient structures (338 compositions, 1915–2025) from the Inorganic Crystal ...
Nik Reeves‐McLaren
wiley   +1 more source

Mineralogy, mineral chemistry, and redox equilibria in ten aggregate particles from asteroid Bennu

Meteoritics &Planetary Science, Volume 61, Issue 8, Page 1905-1927, August 2026.
Abstract Examination of 10 Bennu aggregate particles has revealed the presence of many phases which taken together can provide constraints on the oxygen fugacity (fO2) of Bennu samples. Phyllosilicates (saponite and serpentine), carbonates, oxides (magnetite, chromite), sulfides (pyrrhotite, pentlandite), phosphate (hydroxyapatite, Na‐Mg‐phosphate ...
K. Righter, J. Gorce, L. Le, K. Thomas‐Keprta, Z.E. Wilbur, L.P. Keller, Z. Gainsforth, T.J. McCoy, T.J. Zega, S.S. Russell, H.C. Connolly Jr., D.S. Lauretta   +11 more
wiley   +1 more source

Solid propellant burn rate characterization: Effect of copper chromite blend with oxidiser and its storage

FirePhysChem
This work details the study conducted on composite solid propellants with activated copper chromite (ACR) as burn catalyst for its burn rate change with time due to the interaction of ammonium perchlorate (AP) with ACR.
Sathiskumar PS, Alok Kumar Patel, Vinay Paliwal, Sojan P   +3 more
doaj   +1 more source

Potassium isotopic compositions and exposure ages of evolved and silica‐rich achondrites

Meteoritics &Planetary Science, Volume 61, Issue 8, Page 2140-2162, August 2026.
Abstract Some of the oldest igneous rocks in the Solar System include evolved and silica‐rich achondrites that originate from parent bodies less than 1000 km in diameter, referred to as planetesimals. While Earth was initially in a molten state and required continental crust formation and plate tectonics to generate andesite bulk compositions, evolved ...
Z. Vaci, Z. Tian, P. Koefoed, M. Habermann, M. Humayun, K. Ziegler, H. Busemann, D. Krietsch, J. M. D. Day, K. Wang   +9 more
wiley   +1 more source

Natural Resources and Political Patronage in Africa: An Ethnicity Level Analysis

Review of Development Economics, Volume 30, Issue 3, Page 1957-1972, August 2026.
ABSTRACT We investigate the effect of resource discoveries on ethnicity‐level political patronage in Africa using a large geospatial dataset of 254 ethnic groups in 15 countries over the period 1960–2004. We find that the first (or single first) resource discovery in a virgin ethnic homeland increases the share of cabinet posts of that ethnicity.
Sambit Bhattacharyya, Nemera Mamo
wiley   +1 more source

Experimental Phase Equilibria Study and Thermodynamic Modeling of the Na2O–SnO–SnO2–SiO2 System

Journal of the American Ceramic Society, Volume 109, Issue 7, July 2026.
ABSTRACT Integrated experimental and thermodynamic modeling study of the phase equilibria in the Na2O–SnO–SnO2–SiO2 system in air and in equilibrium with liquid metal has been undertaken for characterizing the thermochemistry of slag in smelting side streams enriched in Sn and optimizing the fuming process. New experimental phase equilibria data at 800°
Hamed Abdeyazdan, Maksym Shevchenko, Evgueni Jak   +2 more
wiley   +1 more source

Optimization of Synergistic Reduction of Copper Smelting Slag and Chromite for Production of Cu-Cr-Fe Master Alloys

Metals
Cu and Cr are the essential alloying elements for low-Ni stainless steels. An effective and economical method has been developed for the direct production of Cu-Cr-Fe master alloys through the synergistic reduction of chromite and copper smelting slag ...
Yaoan Xi, Yi Qu, Sui Xie, Jinfa Liao, Baojun Zhao   +4 more
doaj   +1 more source

Iodimetry method of endogenous deposits search

RUDN Journal of Engineering Research, 2013
The article deals with the theoretical background for the application of iodometry search of endogenous deposits, particularly the behavior of iodine above the ore bodies.
V V Diakonov, A E Kotelnikov, V E Markov, E E Kotelnikov, N A Gorg   +4 more
doaj  

Impact of Pre‐Oxidation Treatments on a Recycled MgO/Steel‐Composite as Carbon Free Anode in Aluminum‐Electrolysis Environments

Advanced Engineering Materials, Volume 28, Issue 10, 20 May 2026.
Cermets (60 vol.% AISI 316L stainless steel, 40 vol.% recycled MgO), intended for use in aluminum electrolysis, were pre‐oxidized in three furnaces with different heating technologies and subjected to a cryolite corrosion test. The different atmospheres influenced the formation of oxide layers, which in turn affected corrosion resistance and ...
Patricia Kaiser, Felix Drechsler, Nora Brachhold, Florian Kerber, Christos G. Aneziris   +4 more
wiley   +1 more source