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Crystal is a crystal of silicon dioxide, and glass is just a molten mixture containing silicon dioxide.

Heat mirror glass is a type of insulated glazing that is designed to reflect heat back into a room during the winter months and block heat from entering during the summer. This is achieved by incorporating a specialized coating between two layers of glass. The coating reflects infrared radiation, which is a significant component of heat energy, while still allowing visible light to pass through. The result is a highly efficient window that contributes to a comfortable indoor environment year-round.