Refractive index of a solid is observed to have the same value along all directions.Comment on the nature of this solid. Would it show cleavage proper

Isotropic solids have same value of reflective index in all the direction. All isotropic solids are amorphous solids. Amorphous solids cut into two pieces with regular surfaces. Therefore, amorphous solids do not show cleavage. An isotropic solid is a solid material in which the physical properties do not depend on its orientation. 

Explanation: Amorphous solids do not show cleavage property because of irregular arrangement of particles. When amorphous solids are cut with the sharp edged tool the newly generated surfaces are irregular and not smooth.