Results 1 to 10 of about 4,092 (217)

Coherent lamellar intergrowth in alkali feldspar [PDF]

Contributions To Mineralogy and Petrology, 2023
AbstractA thermodynamic analysis of coherent lamellar intergrowth resulting from the exsolution of initially homogeneous alkali feldspar is presented. In contrast to earlier treatments, where the simplifying assumption of zero strain in the lamellar interfaces was used, our treatment is more general.
Elena Petrishcheva, Rainer Abart, Abart R   +2 more
exaly   +4 more sources

Diffusion-controlled crack propagation in alkali feldspar. [PDF]

Phys Chem Miner, 2019
The chemically driven propagation of interacting parallel cracks in monoclinic alkali feldspar was studied experimentally. Single crystals of potassium-rich gem-quality sanidine were shifted towards more sodium-rich compositions by cation exchange with a NaCl-KCl salt melt at a temperature of 850 ∘ C and close to ambient pressure.
Petrishcheva E, Rieder M, Predan J, Fischer FD, Giester G, Abart R.   +5 more
europepmc   +7 more sources

Effect of chemically induced fracturing on the ice nucleation activity of alkali feldspar [PDF]

Atmospheric Chemistry and Physics, 2021
Feldspar is an important constituent of airborne mineral dust. Some alkali feldspars exhibit particularly high ice nucleation (IN) activity. This has been related to structural similarities of the ice (101‾0) prism planes and the (100) planes of alkali ...
A. A. Kiselev, A. Keinert, T. Gaedeke, T. Leisner, T. Leisner, C. Sutter, E. Petrishcheva, R. Abart   +7 more
doaj   +3 more sources

Chemically induced fracturing in alkali feldspar [PDF]

Physics and Chemistry of Minerals, 2013
Fracturing in alkali feldspar during Na-K cation exchange with a NaCl-KCl salt melt was studied experimentally. Due to a marked composition dependence of the lattice parameters of alkali feldspar, any composition gradient arising from cation exchange causes coherency stress. If this stress exceeds a critical level fracturing occurs.
Elena Petrishcheva, F D Fischer, J Schreuer   +2 more
exaly   +3 more sources

Lattice strain across Na–K interdiffusion fronts in alkali feldspar: an electron back-scatter diffraction study [PDF]

Physics and Chemistry of Minerals, 2014
Rainer Abart, Zaefferer Stefan, Abart Rainer   +2 more
exaly   +2 more sources

Granitoids and trachytes of Um Shager-Hamadat area, Central Eastern Desert, Egypt: Remote sensing characterization and petrology

Egyptian Journal of Remote Sensing and Space Sciences, 2022
The late Neoproterozoic granitoids of Gebel Um Shager and Gebel Hamadat, Central Eastern Desert of Egypt, in addition to Paleozoic trachytes of both areas were discriminated using Landsat-8, and Sentinel-2 dataset.
Mohamed W. Ali-Bik, Said H. Abd El Rahim, Wael Abdelwahab, Maysa M.N. Taha   +3 more
doaj   +1 more source

Petrology and Zircon morphology of granitoid rocks at um Bogma Environs, south west Sinai, Egypt [PDF]

Delta Journal of Science, 2023
This paper studies the morphology of zircon crystals as well as geological and petrographical characteristics of granitoid rocks at Um Bogma environs, south Sinai, Egypt to provide the rock nomenclatures and to deduce their origin and magma types.
tarek hagag
doaj   +1 more source

Geochronology and geochemistry of the Shanagen hydrothermal vein-type Mo deposit in Derbugan metallogenic belt of the NE China and their geological significance

Frontiers in Earth Science, 2023
The Shanagen hydrothermal vein-type Mo deposit belongs to the Derbugan metallogenic belt, which is located in the Ergun block, NE China. The Mo mineralization is mainly developed in sericitized quartz siltstone around alkali-feldspar granite.
Yunxia Wu, Yunxia Wu, Yunxia Wu, Yu Liu, Yu Liu, Aoran Liu, Aoran Liu, Lifu Tian, Lifu Tian, Yasheng Ye   +9 more
doaj   +1 more source

Statistical analysis on the radiological assessment and geochemical studies of granite rocks in the north of Um Taghir area, Eastern Desert, Egypt

Open Chemistry, 2022
Granite rocks are currently one of the foremost raw materials that can be used for various economic purposes such as ornamentation and building materials, because they do not possess radioactive concentrations and have good physical and mechanical ...
Awad Hamdy A., Abu El-Leil Ibrahim, Nastavkin Aleksey V., Tolba Abdellah, Kamel Mostafa, El-Wardany Refaey M., Rabie Abdalla, Ene Antoaneta, Tekin Huseyin O., Issa Shams A. M., Zakaly Hesham M. H.   +10 more
doaj   +1 more source

Discrimination of Neoproterozoic granitic-phases in Southern-Sinai, Egypt. Remote sensing, petrography and geochemistry

Egyptian Journal of Remote Sensing and Space Sciences, 2021
At Sharm El-Sheikh area a unique association of Neoproterozoic Younger granitic phases is found. These granitic rocks are petrographically identified as monzogranite, syenogranite, alkali feldspar granite, and riebeckite granite.The magma sources of ...
N.I. Abd El Ghaffar, Heba El-Bagoury, D. Sadek Ghabrial, Wael Abdelwahab, Ali I.M. Ismail   +4 more
doaj   +1 more source