Results 81 to 90 of about 14,109 (220)
Quantitative methods for quantification of montmorillonite content in bentonite clays
Georesursy, 2020 This article is devoted to the comparison of various methods for the quantitative determination of montmorillonite content in bentonite clays based on the adsorption of organic molecules and cations.
Petr E. Belousov +3 more
doaj +1 more source
(Table 2) Petrography of volcaniclastic sandstones from Unit III of ODP Hole 135-840B [PDF]
, 1994 (Table 2) Petrography of volcaniclastic sandstones from Unit III of ODP Hole 135 ...
Bøe, Reidulv, Reidulv Bøe (4317967)
core +1 more source
Литосфера, 2019 Research subject. The inner structure, composition, and genesis of the poorly studied formation of weathering crusts are studied with reference to peneplaned platform territories in Kazakhstan and Siberia during the Cretaceous-Paleogene boundary epoch ...
Yu. G. Tsekhovskii +2 more
doaj +1 more source
Mineralogy, mineral chemistry, and redox equilibria in ten aggregate particles from asteroid Bennu
Meteoritics &Planetary Science, EarlyView.Abstract Examination of 10 Bennu aggregate particles has revealed the presence of many phases which taken together can provide constraints on the oxygen fugacity (fO2) of Bennu samples. Phyllosilicates (saponite and serpentine), carbonates, oxides (magnetite, chromite), sulfides (pyrrhotite, pentlandite), phosphate (hydroxyapatite, Na‐Mg‐phosphate ...
K. Righter +11 more
wiley +1 more source
(Table 1B) Stable isotope composition, petrography and epoch at DSDP Site 93-603 [PDF]
, 1987 (Table 1B) Stable isotope composition, petrography and epoch at DSDP Site 93 ...
Reiner Botz (6963686) +3 more
core +1 more source
Acta Crystallographica Section E, 2014 Single crystals of dithulium disilicate, Tm2Si2O7, were obtained in flux synthesis experiments in the system SiO2–Tm2O3–LiF at ambient pressure. The compound belongs to the group of sorosilicates, i.e. it is based on [Si2O7]-units and crystallizes in the
Volker Kahlenberg, Paul Aichholzer
doaj +1 more source
Meteoritics &Planetary Science, EarlyView.Abstract An unusual chondritic xenolith was found in two sequentially prepared thin sections of a sample from the Krymka (LL3.2) chondrite. The xenolith has a rounded, slightly deformed shape of about 5 mm in apparent diameter and is partially surrounded by a double rim made of an inner fine‐grained silicate‐rich rim and an outer sulfide‐rich rim.
Aelita Girich +6 more
wiley +1 more source
Mineral Analysis in Rocks Using XRD and Petrography [PDF]
, 2019 Rock formation in a region is influenced by many factors such as tectonic and volcanic systems of the area. Both activities will affect the microstructure of the rock. This study analyzes mineral composition in three different rocks.
Iqbal, M. (Mochamad) +5 more
core +1 more source
Acta Crystallographica Section E, 2014 Single-crystals of the title compound, nonapotassium triyttrium dodecasilicate difluoride, were obtained from flux synthesis experiments in the system SiO2—Y2O3—KF.
Volker Kahlenberg, Tanja Manninger
doaj +1 more source
Crystallization of dmisteinbergite (hexagonal CaAl2Si2O8) from type B CAI analog melt
Meteoritics &Planetary Science, EarlyView.Abstract Dmisteinbergite is a metastable polymorph of CaAl2Si2O8, which has been found in calcium−aluminum‐rich inclusions (CAIs) in chondrites, although anorthite is the predominant CaAl2Si2O8 phase in natural type B CAIs. The occurrence/absence of igneous dmisteinbergite would put tighter constraints on the thermal history of CAIs.
Yasuaki Tsuruoka +6 more
wiley +1 more source