Results 11 to 20 of about 10,620 (270)
Polymorphism of feldspars above 10 GPa
Nature Communications, 2020 Feldspars are stable at pressures up to 3 GPa along the mantle geotherm, but they can persist metastably at higher pressures at colder conditions. Here, above 10 GPa the authors find new high-pressure polymorphs of feldspars that could persist at depths
Anna Pakhomova +9 more
doaj +2 more sources
Identification of Some Gem-Quality Red and Green Feldspars
CrystalsSunstone is a member of the feldspar group. Natural sunstones from Oregon exhibit unique optical effects and hold significant market value. However, since 2008, there has been a persistent issue of diffused red feldspars masquerading as natural sunstones
Zhongyi Shang +2 more
doaj +2 more sources
Shock effects in feldspars: an overview [PDF]
, 2021 Feldspars are the dominant mineral in the crust of most terrestrial planetary bodies, including Earth, Earth’s moon, and Mars, as well as in asteroids, and thus in meteorites.
Annemarie E. Pickersgill* +9 more
core +1 more source
Hydrogen in Nominally Anhydrous Crustal Minerals [PDF]
, 2003 Systematic infrared and nuclear magnetic resonance investigations of common crustal minerals were undertaken to better understand the geologic significance of minor components of structural hydrous species within these nominally anhydrous minerals ...
Johnson, Elizabeth Ann
core +1 more source
Бюллетень Почвенного института им. В.В. Докучаева, 2018 Morphological, physical-chemical properties, texture, salt composition mineralogical composition of the particle-size fractions 5 mkm of dark-humus quasigleyic solonchakous solonetzic cryoturbated deeply permafrost loamy-sandy soil developed from ...
V. L. Ubugunov +6 more
doaj +1 more source
The crystallization of a tin-bearing granitoid suite: The Bushveld granites in the Zaaiplaats area, South Africa [PDF]
Bulletin of the Geological Society of Finland, 1984 Alkali feldspars from the tin-bearing Bobbejaankop and Lease granites, and from the surrounding barren Main granite in the Zaaiplaats tin-field were studied by X-ray diffraction method. The temperatures and oxygen fugacities of the lowermost Main granite
J.T. Ollila
doaj +1 more source
Geosciences, 2016 The mineralogical indices the Quartz Index (QI), Carbonate Index (CI) and Mafic Index (MI) for ASTER multispectral thermal infrared (TIR) data were applied to various geological materials for regional lithological mapping on the Tibetan Plateau.
Yoshiki Ninomiya, Bihong Fu
doaj +1 more source
Heliyon, 2023 In the pursuit of sustainable porcelain production, this research examines the potential of using recovered automotive glass as a substitute for traditional feldspar, specifically feldspar imported from Spain. Porcelain samples were sintered at different
A. Djemli +8 more
doaj +1 more source
Photoconductivity on K-feldspar [PDF]
International Journal of Modern Physics B, 2021 In the development of most phenomenological models used to explain the infrared excited luminescence, a major assumption is usually made in the degree of freedom the excited charge has. One of the two extremes is normally assumed: charge is free to move anywhere over the whole crystal, or it is confined close to the trap and the centers immediately ...
openaire +1 more source
Ice nucleation by feldspars and carbon nanomaterials [PDF]
, 2016 Immersion mode heterogeneous ice nucleation is the crucial first step in the glaciation of mixed-phase clouds, which have an important but poorly understood influence on global climate.
Whale, Thomas Francis
core +6 more sources