## 5 Comparative Analysis: Mechanical vs. Petrographic Properties
### Case Studies and Experimental Results  
This section presents a detailed comparative analysis of existing case studies and experimental findings that investigate the relationship between mechanical and petrographic properties in nortie and similar rock types. The discussion encompasses variations in hardness, strength, stress response, and brittleness indices alongside the influence of mineral composition, grain size, and microstructural features. The study by [PERSON] et al. [96] (2017) explored the relationship between mineral characteristics, grain size, and the mechanical properties of rock materials, providing an introduction for new researchers in the field. The study utilized regression analysis to examine the relationship between mechanical properties and textural features. Although significant progress has been made in understanding these connections, challenges remain, such as the variability in mineral composition and the complex influence of microstructures on mechanical behavior. Regression analysis, both single and multiple, are performed on experimental data to examine the relationship between mechanical properties and textural characteristics. These textural features are influenced by factors such as mineral composition, grain size, shape, spatial distribution, porosity, and inherent microcracks. [PERSON] and [PERSON] [99] (2015) investigated simple regression analysis to examine the relationship between petrographic characteristics and engineering properties using 10 granite rock samples. The findings of the study were that the strength of the rock is influenced by the mean grain size, with strength increasing as grain size decreases. Additionally, the mineral composition plays a key role in determining rock strength; thus, a higher quartz content enhances strength, while feldspar reduces it, especially when feldspar is altered. The presence of mica minerals also weakens the rock, with a higher mica content leading to a decrease in strength. Furthermore, the weathering grade affects the strength of the rock, even in samples with smaller grain sizes. [PERSON] and [PERSON] [100] (1999) used simple regression analysis to examine the correlations between the petrographic features and engineering properties by means of 19 distinct granitic rock samples. The findings in this study indicate that the mean grain size significantly impacts rock strength, with strength increasing as grain size decreases. Mineralogical composition is another key factor controlling rock strength, particularly the variations in quartz and feldspar contents. These minerals have opposite effects on strength: quartz has a positive effect, while feldspar has a negative one. Furthermore, there are lower correlations between mechanical properties and petrographic parameters than there are between physical qualities and petrographic behaviors. The study by [PERSON] et al. [7] (2022) highlights the impact of mineral composition, grain size, shape, and anisotropy on rock mechanics. Variations in the quartz and feldspar contents were the primary factors influencing rock strength as both minerals significantly affect the mechanical properties of the rock. Compressive strength and crack propagation are influenced by mineral composition, such as opaque and altered minerals, with grain size also playing a crucial role in determining the mechanical properties. The study by [PERSON] et al. [107] (2022) highlights that the genesis environment of ultramafic rocks from the Veria Nauousa and Gerania ophiolite complexes significantly affects their mineralogical and structural characteristics, which in turn determine their suitability as concrete aggregates. Similarly, norite, a coarse-grained mafic rock formed in deep crustal settings, shares comparable petrogenic influences that may impact its physico-mechanical properties, suggesting it could also be a suitable aggregate material if its durability and stability meet construction requirements. The study by [PERSON] et al.