Results 81 to 90 of about 1,840 (197)

What Earth Erases: Weathering Diversity of Mineral Phases Formed in a Highly Reduced Environment Hosted in Aubrites

Journal of Geophysical Research: Planets, Volume 131, Issue 8, August 2026.
Abstract Meteorites serve as an exceptional source of insight into our planet and the Solar System. Most meteorite fragments were recovered hundreds to thousands of years after their fall, and therefore exhibit varying degrees of terrestrial weathering, which has altered or completely removed weather‐sensitive mineral phases.
M. Kołodziej, B. Pieterek, G. Zieliński, K. Załęski, E. Coy   +4 more
wiley   +1 more source

Coupled intra‐ and inter‐tunnel short‐range order in hollandites: a case study of mannardite Ba[(Ti4+)6(V3+)2]O16

Acta Crystallographica Section B, Volume 82, Issue 4, Page 439-446, August 2026.
Single‐crystal X‐ray diffuse scattering combined with Monte Carlo simulations and 3D‐ΔPDF analysis reveals complex short‐range order in mannardite, involving coupled Ba–Ba interactions within and between tunnels and framework relaxation.Mannardite, Ba[(Ti4+)6(V3+)2]O16, a mineral of the hollandite supergroup, is characterized by a tunnel structure ...
Ella Mara Schmidt, Marta Morana, Cristian Biagioni, Arianna Minelli, Alexei Bosak, Giovanni Orazio Lepore   +5 more
wiley   +1 more source

Flotation of Sulphide Minerals Using Organosolv Lignin as Collector—Pilot-Scale Trials

Materials Proceedings
The use of toxic chemicals as flotation reagents raises concerns about the sustainability of the process and its environmental impact. Xanthates are a family of efficient collectors that find application in the selective recovery of lead, gold and zinc ...
Panagiotis M. Angelopoulos, Georgios Anastassakis, Nikolaos Kountouris, Maria Taxiarchou, Effrosyni Koutsotheodorou, Tilemachos Pefkos, Vasileios Klepkos, Christina Samara, Giorgos Mprokos   +8 more
doaj   +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

Physicochemical constraints and fluid evolution pathways in skarn mineralization: insights from sphalerite geochemistry at the Dafang Pb–Zn–Au–Ag deposit, South China

Frontiers in Earth Science
Important Mid-Late Jurassic Pb–Zn polymetallic skarn deposits are widely distributed in South China, yet physiochemical conditions and migration of the ore-forming fluids in skarn deposits are poorly constrained. The Dafang Pb–Zn–Au–Ag deposit (38 kt Pb @
Wusheng Wang, Hongjie Shen, Hongjie Shen, Shihong Huang, Jian Shi, Yu Zhang, Yu Zhang   +6 more
doaj   +1 more source

Research on Process Mineralogy of a Refractory Lead-zinc Ore in Chengde, Hebei and Analysis of Factors Affecting Flotation

Kuangchan zonghe liyong
Based on fluorescence spectrum analysis and chemical multi-element analysis, through the process mineralogy study of a refractory lead-zinc mine in Hebei, the mineral composition, structure, main mineral embedding characteristics of the ore and the ...
Guanglin QIN
doaj   +1 more source

Ore genesis of the large Luobugaizi lead-zinc deposit in Xinjiang, NW China: constrains from lead isotope, in-situ trace elements and sulfur isotope of sulfides

Frontiers in Earth Science
The recently discovered large Luobugaizi Pb-Zn deposit, located at the junction of the South Pamir and Karakoram Mountains, is a key component of the West Kunlun–Karakoram Pb-Zn Metallogenic Belt.
Rui-Hong Huang, Hai-Xiang Zhao, Jia-Xin Wang, Chuan-Lin Zhang   +3 more
doaj   +1 more source

OXIDATIVE AMMONIA LEACHING OF SPHALERITE CONCENTRATE

Selçuk Üniversitesi Mühendislik, Bilim ve Teknoloji Dergisi, 2005
This paper presents a study of kinetics of leaching of sphalerite concentrate in ammoniasolutions. The effects of ammonia concentration, oxygen partial pressure, reaction temperature andparticle size on the leaching rate were investigated. The shrinking core model was applied to the resultsobtained from these experiments. Reaction on order with respect
Salih Aydoğan, Ali Aras, Mehmet Canbazoğlu   +2 more
openaire   +5 more sources

Colour of Sphalerite

Colour of Sphalerite
The colour of sphalerite is white nearly colourless when pure, whereas sphalerite with high Fe content is almost black in colour. Besides a minor amount of cadmium and manganese is contained in addition to iron. The present writer has carried out some quantitative studies on the colour of sphalerite, especially in connection between the chemical ...
openaire  

The Separation of Sulfide Minerals from Fluorapatite Ore in Acidic De-Magnesium Flotation Process. [PDF]

Materials (Basel)
Luo L, Yang M, Zhang H, Yang L, Rao F.
europepmc   +1 more source