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What is the sapphire crystal?
Sapphire crystal is an optically transparent, crystalline material that belongs to the Rhombohedral, class 3m, crystallographic system. Some unique qualities of sapphire:
Second only to diamond in hardness.
Sapphire is thermally stable at extremely high temperatures with a melting point of 2030C.
Exceptional chemical stability.
Very low dielectric constant and very low loss tangent value.