The general chemical formula for hornblende is: {eq}(Ca,Na)_{2-3}(Mg,Fe,Al)_5(Al,Si)_8O_{22}(OH,F)_2 {/eq} Hornblende Occurrence Hornblende Mineral Characteristics Hornblende Variances Hornblende Uses Lesson Summary Frequently Asked Questions ...
Hornblende formulae were calculated on the basis of 24O+OH+Cl+F. Most samples are magnesio-hornblendes, ferroan pargasitic hornblendes and ferroan hastingsitic hornblendes, with weight fractions of Fe 3+ /(Fe 2+ +Fe 3+ ) ranging from 0.15 to 0.50. An oxy-amphibole component of 0...
F. Ridolfi, A. Renzulli, and M. Puerini, "Stability and chemical equilibrium of amphibole in calc-alkaline magmas: an overview, new thermobarometric formula- tions and application to subduction-related volcanoes," Contrib. Mineral. Petrol. 160 (1), 45-66 (2010)....
First- and second-boiling processes impact differently on the behaviour of incompatible fluid-mobile elements, such as chlorine and copper, during degassing. In natural systems, fluid-mobile elements evolve along paths intermediate between these two end-members through competition between enrichment via c...
Teall JJH (1885) The metamorphism of a dolerite dyke into hornblende schist. Q J Geol Soc London 41:133–144 Article Google Scholar Vaughan PJ, Green HW, Coe RS (1984) Anisotropic growth in the olivine spinel transformation of Mg2GeO4 under nonhydrostatic stress. Tectonophysics 108:299–32...
Chromium enters the crystal structure of pyroxenes in variable amounts. Only small admixtures of Cr can be found in common calcic clinopyroxenes with a structural formula M2M1(Si,Al)2O6, where M2 site is occupied mainly by Na and Ca, and M1 site by Mg, Fe2+, Al, V, Ti, Fe3+ and...
Introduction Chromium enters the crystal structure of pyroxenes in variable amounts. Only small admixtures of Cr can be found in common calcic clinopyroxenes with a structural formula M2M1(Si,Al)2O6, where M2 site is occupied mainly by Na and Ca, and M1 site by Mg, Fe2+, Al, V, Ti...
Ca (per formula unit p.f.u.) along the cheralite substitution trend in the monazites. (c,d) Garnet core (c) to rim (r) zonations in almandine (Alm-50%, due to scale), pyrope (Prp), grossular (Grs), and spessartine (Sps) components (in Mol %, calculated from mole fraction ×...