H Amrollahi - M.Sc. Student in Rock Mechanics, Department of Mining Engineering, Isfahan University ofTechnology, Isfahan, Iran
A Baghbanan - Assistant Professor, Department of Mining Engineering, Isfahan University of Technology, Isfahan,Iran,
S.M.M Safaei A. - B.Sc. Students in Mineral Exploration Engineering, Department of Mining Engineering, IsfahanUniversity of Technology, Isfahan, Iran
M.J Majlesi - B.Sc. Students in Mineral Exploration Engineering, Department of Mining Engineering, IsfahanUniversity of Technology, Isfahan, Iran

Grain size distribution is an important microparameter of rock whichhas a significant effect on its characteristics. Determining therepresentative size distribution of rock grains is practically difficult.Previous attempts in the literature to measure this parameter haveseveral disadvantages. In this study, an accurate and yet simplemethod is developed in which, grains size distribution of a rock isevaluated directly from the thin sections. The proposed method isexperimented successfully for three crystalline marbles, i.e. Neiriz,Baghat and Maron. Results reveal that Maron marble has particleradius ranged between ۰.۱۱-۲.۵۲ mm while Baghat and Neirizmarbles’ distribution is ۰.۴۹-۵.۰۷ mm and ۰.۱۵-۱.۸۹ mm, respectively.T-Test analysis shows that difference between the marbles grain sizedistributions is significant. Additionally, one-way ANalysis OfVAriance (ANOVA) proves that the three marbles are anisotropic ingrain scale.

Grain size distribution, Thin section, T-Test, ANOVA