pyroxene [ (a) A group of dark rock-forming silicate minerals, closely related in crystal form and composition and having the general formula: ABSi 2 O 6 , where A = Ca, Na, Mg, or Fe+ 2 , and B = Mg, Fe +2 , Fe + 3, Fe, Cr, Mn, or Al, with silicon sometimes replaced...
Pyroxenesare single-chain silicates with the general formula XYSi2O6, where X and Y are either both divalent cations (mainly Ca, Fe, Mg), or mono- (Na, Li) and trivalent cations (Al, Fe) respectively. The stacking of chains gives rise to two types of cavities, labeled M1 (close to...
The chemical composition of minerals of the pyroxene group can be expressed by the general formula XYZ2O6, in which X= Na+, Ca2+, Mn2+, Fe2+, Mg2+, Li+; Y= Mn2+, Fe2+, Mg2+, Fe3+, Al3+, Cr3+, Ti4+; and Z= Si4+, Al3+. The range of possible chemical substitutions in ...
(Minerals) any of a group of silicate minerals having the general formula ABSi2O6, where A is usually calcium, sodium, magnesium, or iron, and B is usually magnesium, iron, chromium, manganese, or aluminium. Pyroxenes occur in basic igneous rocks and some metamorphic rocks, and have colours...
The pyroxenes are a group of important rock-forming silicate minerals found in many igneous and metamorphic rocks. They share a common structure consisting of single chains of silica tetrahedra and they crystallize in the monoclinic and orthorhombic systems. Pyroxenes have the general formula XY(Si...
The meaning of PYROXENE GROUP is a group of silicate minerals closely related in crystal form and having the general formula ABSi2O6 where A represents usually Ca or Na and B is usually Mg, Fe, or Al that includes the orthorhombic species enstatite and h
glasses with pyroxene stoichiometry following the formula Mg(x)Fe(1-x)SiO_3_ with x=0.4, 0.5, 0.6, 0.7, 0.8, 0.95, and 1.0 and glasses with oliv... J Dorschner,B Begemann,T Henning,... - 《Astronomy & Astrophysics》 被引量: 1014发表: 1995年 Modelling of major elements in mantle...
The new mineral kushiroite, belonging to the pyroxene group, was first discovered in a refractory inclusion in the CH group carbonaceous chondrite ALH 85085. The chemical formula is Ca1.008(Mg0.094Fe0.034Al0.878)(Al0.921Si1.079)O6, containing 88% CaAlAlSiO6 and 12% diopside components. We ide...
The chemical composition of minerals of the pyroxene group can be expressed by the general formula XYZ2O6, in which X= Na+, Ca2+, Mn2+, Fe2+, Mg2+, Li+; Y= Mn2+, Fe2+, Mg2+, Fe3+, Al3+, Cr3+, Ti4+; and Z= Si4+, Al3+. The range of possible chemical substitutions in ...