Properties of Nephelinite and Pseudotachylite play an important role in determining the type of rock. Along with Nephelinite vs Pseudotachylite properties, get to know more about Nephelinite Definition and Pseudotachylite Definition. For the ease of understanding, the properties of rocks are divided into physical and thermal properties. Rocks have a variety of properties like hardness, color, specific gravity, fracture, cleavage, luster etc. Know all about physical and thermal properties of Nephelinite and Pseudotachylite.