Abstract
Xenolithic structures are considered to be natural defects in theigneous rocks that highly affect their physicochemical and mechanicalproperties. They are foreign rock fragments trapped in the magmaor lava during the cooling process. They are totally unrelated to theigneous rocks, as they compose from different types of rock piecesthat enclosed in the monumental granites during their emplacement.This paper aims to study and characterize the xenolith fragmenttrapped in the studied granitic obelisk. The analytical study wascarried out using different techniques such as polarizing microscope,x-ray diffraction, scanning electron microscope, EDS elementalanalysis and BET surface area. The results clarified that the studiedxenolith fragment is classified as biotite schist xenolith. In addition, itwas observed that the xenolith fragment not only affects theaesthetic appearance of the studied granitic obelisk but also itrepresents a serious weakness point in its structure.
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