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Sapphire is a single crystal aluminum oxide (Al2O3). Its Mohs hardness..

MgF2 is a tetragonal positive birefringent crystal. MgF2 has good chem..

CaF2 is a cubic single crystal. It has good transmission from UV to mi..

Silicon( Si) is a good IR material , it can be used from 1.2 to 7 micr..

Germanium(Ge) is widely used in far infrared wavelength, it is transpa..