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Crystalline materials :
  they have long range order .
  anisotropic in nature .(get different values for some physical quantities like refractive index , conductivity  when measure in different directions ) 
  particles ( atoms , molecules , ions ) are regularly arranged .
  when a crystalline solid is cut with a sharp edged tool , we get a smooth surface.
  true solids.
Amorphous solid :
 they have short range order.
 isotropic in nature.
 particles are irregularly arranged .
 when an amorphous solid is cut with a sharp edged tool , we get irregularly arranged rough surface .
 they are also called pseudo solid and super cooled liquid .
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