Results 41 to 50 of about 2,032 (202)
Geochemistry and U-Pb geochronology of columbite of the Cachoeirinha Deposit, Rondônia Tin Province, Brazil [PDF]
Brazilian Journal of GeologyThe Cachoeirinha Sn ± (Nb-Ta) deposit is an important producer of the Rondônia Tin Province. It is inserted in the regional unit named Rondônia Intrusive Suite (995–956 Ma) and hosts granular accumulations of columbite group minerals (CGM) embedded in ...
Raquel Guimarães da Silva +4 more
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A thorny evolution: first Triassic ammonoid with a ventral apertural elongated rostrum
Papers in Palaeontology, Volume 12, Issue 4, July/August 2026.Abstract Ornamented terminal peristomes are common in ammonoids, but pronounced conch projections are rare, particularly in the Triassic. A new early Spathian assemblage from southeastern Idaho yielded two ammonoid specimens with an impressive terminal mid‐ventral elongated rostrum, documenting the first Triassic occurrence and one of the few ...
Arnaud Brayard +8 more
wiley +1 more source
Columbite from Chywoon quarry in the Carnmenellis granite, Cornwall
, 2005 Minerals of the columbite-tantalite group are rare in Britain, though workable deposits occur in various parts of the world. Ferrocolumbite has now been found in specimens collected in 1995 from material that came from a pegmatite-lined miarolitic cavity
Moulding, D, Tindle, A. G.
core +4 more sources
Journal of Advanced Dielectrics, 2023 The paper reports results on the complex study on ferroelectric ceramics that represent solid solutions containing components with a perovskite-type or columbite-type structure.
M. O. Moysa +8 more
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New Zealand Journal of Geology and Geophysics, Volume 69, Issue 2, June 2026.Detrital platinum group minerals (PGM) are rare and distinctive in Pleistocene–Holocene sedimentary systems of the southern South Island, thereby enabling tracking of their long‐distance transport for ∼200 km. The first ∼100 km of transport involved Pleistocene glaciofluvial processes southwards down the Waiau River, where PGM (principally Pt–Fe and Ru–
Dave Craw, Marshall Palmer
wiley +1 more source
Columbite - Nevel Mine (MGS Collection)
, 2019 Columbite - Nevel Mine (MGS Collection)https://digitalmaine.com/mgs_geologic_field_photos/7106/thumbnail ...
core +1 more source
RADIOACTIVITY AND MINERALOGICAL INVESTIGATIONS ON YOUNGER GRANITES OF GABAL SHEIKH EL-ARAB AREA, SOUTHERN SINAI, EGYPT [PDF]
Delta Journal of Science, 2006 The younger granites of the studied area vary in composition from monzogranite, syenogranite to alkali feldspar granite. They exhibit silicification, kaolinitization and ferrugination as a result of the post-magmatic hydrothermal alteration.
ABDEL MONEM M. OSMAN +4 more
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In‐Wheel Piezoelectric DC Power Generator With Zero Resistive Torque
Advanced Science, Volume 13, Issue 18, 27 March 2026.In this paper, we present a wheel‐shaped direct‐current piezoelectric generator (DC‐PG) that fundamentally overcomes these constraints by producing phase‐stable DC electricity directly from rolling motion. By embedding this system into suitcase wheels, we demonstrated a fully integrated real‐time location tracking system powered solely by mechanical ...
Hyun Soo Kim +19 more
wiley +1 more source
Peculiarity of a magnetic structure in a quasi-one-dimensional columbite Co0.4Ni0.6Nb2O6
AIP Advances, 2020 Quasi-one-dimensional (Q1D) spin chain systems have great potential applications in high-density information storage devices, quantum information and computers, because of their quantum magnetism properties. The low-dimensional magnetic behavior has been
P. W. C. Sarvezuk +2 more
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Phase diagram and dielectric properties of Pb(In1/2Nb1/2)O3-Pb(Mg1/3Nb2/3)O3-PbTiO3 ceramics [PDF]
Journal of Advanced Dielectrics, 2015 xPb(In1/2Nb1/2)O3-Pb(Mg1/3Nb2/3)O3-PbTiO3(xPIN–yPMN–zPT) ternary ceramics with morphotropic phase boundary (MPB) composition were synthesized by columbite precursor method.
Dabin Lin +3 more
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