All data on this site have been placed in the public domain by the contributors A polycrystal is composed of many microscopic crystals (called crystallites or grains) And an amorphous solid (such as glass) has no periodic arrangement even microscopically A crystal or crystalline solid is a solid material whose constituents (such as atoms, molecules, or. Crystal, ice, freeze, congeal, frost [especially in reference to a mineral or glass]
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