Comparative Analysis of Mineralogical And Geochemical Properties of Afghan And Surrounding Countries Marbles And Granites: Challenges And Opportunities

Abstract

Abstract
Twenty-two different granite and marble sample are currently being examined in labs.
Stones are cut into thin section and observed under a polarizing microscope (Leica DM750P)
with XRF (X-ray Fluorescence). Analysis and evaluation of the samples are broken down into
percentages of silicon oxide, sodium, and potassium in the granites with SiO2 at (52-65 wt.%),
Na2O+K2O at (4.7-12.1wt.%) and mineral composition and percentage of rock-forming
materials are broken down into potassium feldspar minerals at (32-40 wt.%), plagioclase at
(25-35 wt.%), quartz at (5-10 wt.%), and accessory minerals at <1% with fluidal structures
being determined. The percentage ratio of oxides and minerals indicates that these rocks,
mainly correspond with grano-diorites and intermediate igneous rocks, such as diorites and
andesite.
Marbles, like granites, were also analyzed and interpreted by the above two methods, due
to presence of fossils and large amounts of impurities like Mud, Mica, Iron oxide, and silicates,
these marbles are categorized into carbonate rocks of sedimentary origin and law quality
marble which were formed in the lower degree of metamorphism.
Individual rocks have different erosion resistances because of dissimilar constituent
minerals, formation conditions, and origin. Those with less resistant minerals, less water
absorption, and porosity are more likely to be negatively influenced. Granites whit a higher
amount of quartz, for example, have a higher degree of hardness, greater strength and
durability than intermediate igneous rock, so they are more resistant to erosion