Which of the following substance is not crystalline?
A. PlasticB. IceC. DiamondD. None of these Brief Facts About Crystalline Solid: A crystal or crystalline solid is a solid material whose constituents (such as atoms, molecules, or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions. Examples of large crystals include snowflakes, diamonds, and table salt.