This chapter, “Miscellaneous Rock Properties,” delves into essential physical and mechanical characteristics crucial for geological engineering and mining. It explores parameters such as density, porosity, and permeability, pivotal in understanding rock behavior. Mechanical properties like elastic modulus and Poisson's ratio are vital for assessing rock strength, critical for infrastructure integrity in mining and geological operations. The chapter discusses apparent porosity, emphasizing its calculation and implications on rock strength variation, crucial for structural stability assessments. Impact toughness and fracture toughness are explored as measures of a rock’s ability to resist fracturing under dynamic and static loads, pivotal in hydraulic fracturing and material durability assessments. Abrasive hardness is discussed in terms of a rock’s resistance to wear and its impact on industrial applications like tunnel boring. The chapter also covers ball mill grindability, which measures a rock’s grindability for industrial processes, essential in optimizing grinding operations. This comprehensive overview provides insights into diverse rock properties, their measurements, and their critical roles in engineering and industrial applications.