Results 11 to 20 of about 2,908 (168)

Ice nucleation activity of silicates and aluminosilicates in pure water and aqueous solutions – Part 1: The K-feldspar microcline [PDF]

Atmospheric Chemistry and Physics, 2018
Potassium-containing feldspars (K-feldspars) have been considered as key mineral dusts for ice nucleation (IN) in mixed-phase clouds. To investigate the effect of solutes on their IN efficiency, we performed immersion freezing experiments with the K ...
A. Kumar, C. Marcolli, B. Luo, T. Peter
doaj   +2 more sources

Microtextural, spectroscopic, and chemical characterization of amazonite from the Serra Branca Pegmatite, Northeastern Brazil

Brazilian Journal of Geology, 2022
The Serra Branca pegmatite in northeastern Brazil is unique because of its megacrysts of bluish-green amazonite currently exploited for ornamental purposes and as high-quality gemstones.
Glenda Lira Santos, Sandra de Brito Barreto, Igor Manoel Belo de Albuquerque e Souza, José Ferreira de Araújo Neto, Luis Sanchéz-Muñoz, Lauro Cézar Montefalco de Lira Santos   +5 more
doaj   +1 more source

How Water Binds to Microcline Feldspar (001) [PDF]

, 2023
Microcline feldspar (KAlSi3O8) is a common mineral with important roles in Earth’s ecological balance. It participates in carbon, potassium, and water cycles, contributing to CO2 sequestration, soil formation, and atmospheric ice nucleation.
Giada Franceschi (8790323), Florian Mittendorfer (1281066), Ulrike Diebold (1304019), Luca Lezuo (17710705), Michael Schmid (3882), Andrea Conti (9234093), Rainer Abart (3129741)   +6 more
core   +3 more sources

MINERALOGY OF APATITE-AEGIRINE-MESOPERTHITE PEGMATITES OF MINE NO. 243 OF THE ILMENY STATE RESERVE (SOUTH URALS) [PDF]

Минералогия, 2023
The paper describes mineralogy of apatite-aegirine-mesoperthite pegmatites, which are located in a fenite halo at the southeastern contact of the Selyankino syenite block (Ilmeny State Reserve, South Urals). Two pegmatite veins are exposed by mines.
E.P. Makagonov, S.А. Repina, M.A. Rassomakhin   +2 more
doaj   +1 more source

K-Ar geochronology for hydrothermal K-feldspar within plagioclase in a granitic pluton: constraints on timing and thermal condition for hydrothermal alteration

Heliyon, 2021
This study presents the K-Ar geochronology for hydrothermal K-feldspar in plagioclase alteration, including methodology and application to the Toki granite, in central Japan.
Takashi Yuguchi, Koshi Yagi, Eiji Sasao, Tadao Nishiyama   +3 more
doaj   +1 more source

X-ray study of potassium feldspars from different granitoid types and gneisses of Papuk Mt. (Slavonia, Croatia)

Geologia Croatica, 2011
Potassium feldspars from different granitoids and gneisses of Papuk Mt. (Slavonia, Croatia) have been investigated by X-ray powder diffraction. Diffraction patterns classically observed as well as patterns calculated by Rietveld refinement were compared ...
Marija Horvat, Darko Tibljaš, György Buda, György Lovas   +3 more
doaj   +1 more source

Ice nucleation properties of K-feldspar polymorphs and plagioclase feldspars [PDF]

Atmospheric Chemistry and Physics, 2019
The relation between the mineralogical characteristics of size-selected feldspar particles from 50 to 800 nm and their ability to act as ice-nucleating particles (INPs) in the immersion mode is presented.
A. Welti, A. Welti, U. Lohmann, Z. A. Kanji   +3 more
doaj   +1 more source

Micro-Raman Spectroscopy and X-ray Diffraction Analyses of the Core and Shell Compartments of an Iron-Rich Fulgurite

Molecules, 2022
Fulgurites are naturally occurring structures that are formed when lightning discharges reach the ground. In this investigation, the mineralogical compositions of core and shell compartments of a rare, iron-rich fulgurite from the Mongolian Gobi Desert ...
Ahmet Karadag, Ersin Kaygisiz, Timur Nikitin, Sinan Ongen, Gulce Ogruc Ildiz, Namik Aysal, Ayberk Yilmaz, Rui Fausto   +7 more
doaj   +1 more source

How Water Binds to Microcline Feldspar (001). [PDF]

J Phys Chem Lett
Microcline feldspar (KAlSi3O8) is a common mineral with important roles in Earth's ecological balance. It participates in carbon, potassium, and water cycles, contributing to CO2 sequestration, soil formation, and atmospheric ice nucleation.
Franceschi G, Conti A, Lezuo L, Abart R, Mittendorfer F, Schmid M, Diebold U.   +6 more
europepmc   +2 more sources

The Tonigala granite, N. W. Ceylon [PDF]

Bulletin of the Geological Society of Finland, 1971
A pink, microcline granite at Tonigala in north-western Ceylon occurs as a concordant sheet, one to two miles wide and about 10 miles long, in a complex of migmatitic and granitic biotite and biotite-hornblende gneisses belonging to the PreCambrian ...
P.G. Cooray
doaj   +1 more source