hornfels is a rock or mineral
Sandstone
Neither. It has no visible grain.
Grain size increases in the process of recrystallization.
Metamorphic.
Hornfels is a type of rock that is metamorphic. They usually have bands and fine grain, and can come in different colors, such as light gray and dark gray.
hornfels is a rock or mineral
hornfels is red
I too would like an answer to this question as it seems hornfels could be of varying grade dependant on the temperature. The facies of contact metamorphism progress in temperature at relatively low pressure from the Albite-Epidote Hornfels Facies to the Hornblende Hornfels Facies, to the Pyroxene Hornfels Facies. It seems that hornfels do have differant grades.
there is no visible grain size
Small to medium grain size.
Particle size is another name for the term grain size.
Typically an opaque green, greenish-brown, brown or black color.
Slaet in grain size is the size of sand crystals.
Sandstone
Hornfels may be used during construction projects or in the building of roadways. They may also be used as whetstones.
Neither. It has no visible grain.