Fenokinoshitalite, ideally BaFe2+3(Si2Al2)Ot0(OH)2, is the iron-rich analogue of kinoshitalite, and thus a new species of the brittle mica group. Samples commonly have considerable chemical substitutions, with large cations (e g., K, Na) for Ba, mediumsize cations (e.g., Mg, Mn, Ti, Al, Fe3*) in octahedral sites, and F for OH. The color is dark green, the luster is vitreous, thin grarns are tra...

By Korzhinsky and Schrienemakers, methods, phase relations of Mn-Al-Ca-silicates and other minerals in highly oxidized quartzites and schists of blueschist type metamorphism have been discussed. Because, such rocks were extensively studied in central Shikoku of Japan and in Andros and Evvia islands of Greece, they have been considered as thermodynamic system for discussion. The system contains ...

Intracrystalline diffusion is an invaluable tool for estimating timescales of geological events. Diffusion typically modeled using gradients in chemical potential caused by variations composition. However, derived uniform pressure and temperature conditions therefore cannot be used to model when there are stress. Internal stress minerals will create strain energy which, addition composition, dr...

Abstract It is well known that some garnet compositions can incorporate hydrogen and/or fluorine at levels up to several wt%. However, accurate measurement of these elements be difficult trace minor concentration levels, so they are frequently ignored in routine chemical analysis. Furthermore, the mechanisms H incorporation still under debate, and only one mechanism for F substitution commonly ...

We describe the Jebel Aja igneous intrusion (JAII), which sits at farthest northeastern edge of exposed Arabian Shield in Saudi Arabia. The JAII consists late Neoproterozoic post-collisional A-type granites, and was emplaced during tectonic extension. It is a composite pluton consisting granitic core (monzogranite, syenogranite alkali feldspar granite) surrounded by later phase alkaline peralka...

The Yamrang Pegmatite in the Ikhabu Field, Eastern Nepal is Nepal’s primary source of aquamarine. This paper reports detailed mineralogy and whole rock granite pegmatite geochemistry, major trace element data for alkali feldspar muscovite order to classify aquamarine-bearing Pegmatite, elucidate beryl-saturation processes evaluate potential geochemical exploration tools beryl-pegmatites. Five i...