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Please use this identifier to cite or link to this item: http://hdl.handle.net/11375/17553
Title: The Crystallographic Investigation of a Strontium Labradorite
Authors: Cordahi, George
Department: Chemistry
Keywords: precession photography;artificial strontium labradorite;feldspars;cation;crystal symmetry;lattice parameters;crystal system;space group;structure
Abstract: Precession photography was used to determine the lattice parameters, the crystal system, the space group and the structure of an artificial Sr-labradorite of composition: Ab27, SrAn73. C= 7.107Å, Ɣ= 90 degrees, β= 115.834 degrees. The crystal system is monoclinic, space group= C2/ m and structure is albite type, reflections being restricted to the 'a' type. The abundance, lithophile characteristics and appropriate ionic radii of elements in Groups IA and IIA are the factors governing their presence as cations of feldspars in nature. The structures of feldspars are discussed as a function of the relative proportion of cations of a charge of +1 and +2. The crystal symmetry (i.e. monoclinicity or triclinicity) is discussed as a function of the ionic radius of the cation.
URI: http://hdl.handle.net/11375/17553
Appears in Collections:Bachelor theses

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