The chemical composition of obsidian samples from 28 sources in Western America is that of a high alumina glass (ca. 12 wt% Al 2O 3) with a silica content exceeding that of normal granite. Considerable complexity of phase states is indicated by a wide range of variability of properties. ...
The Physical and Chemical Properties of Minerals are the characteristics that help in identifying and understanding minerals. Physical properties include observable traits like color, luster, hardness, cleavage, and density. Chemical properties refer to the mineral's composition and reactivity, such as ...
Composition 1. Introduction Interest in the application of Raman spectroscopy to geosciences has increased substantially over the last decades. Raman spectroscopic analysis is non-destructive, and it is a relatively straightforward and flexible analytical technique for rapid characterization of geologic materia...
A new physicochemical model is proposed to predict and calculate the viscosity of magmatic melts and water diffusion as functions of the following parameters: P tot. ; P fl. ; T ; melt composition, including volatiles (H 2 O, OH , CO 2 , CO 3 2 , F , Cl ); cation ratios: Al 3...
So far, we have demonstrated that small differences in the anhydrous composition of basalts control the nanocrystallization of Fe-Ti-oxides. Transferring our findings to a broad range of eruptive scenarios requires the investigation of hydrous magma at eruptive temperatures and pressures. This led us ...
The invention relates generally to a composition and a method for selective removal of a barrier layer in chemical mechanical polishing. In one aspect, the composition for selective removal of a barri
(1994). Mineralogical and textural controls on the organic composition of coastal marine sediments: hydrodynamic separation using SPLITT fractionation. Geochimica et Cosmochimica Acta 58, 879–893. CrossRef Lewan, M.D. (1997). Experiments on the role of water in petroleum formation. Geochimica et...
Clay mineralogy and chemical composition of bentonites from the Gourougou volcanic massif (northeast Morocco). Clays and Clay Minerals, 53, 250-267.Ddani, M., Meunier, A, Zahraqui, M, Beaufort, D, Wartiti, M E, Fontaine, C., Boukili, B., Mahi, B E. (2005). Clay mineralogy and...
where η 0 is a pre-exponent constant for the viscosity of liquids at T →∞ (η 0 = 10 3.5 ±10 0.1 dPa·s, or poises); T is the temperature in K; E X P is the activation energy of viscous flow (cal/mole), which is a function of melt composition, including volatile component...
respec-tively.The results indicate that all sample with the main chemical composition of SiO2 and Al2O3 are in vitreous state,except two samples(B1 and H3) that are in crystalline state.Tektite and obsidian samples can be distinguished by the chemical composition analysis.The content of iron ...