???Ti, Titanium
Titanium is a chemical element with the symbol Ti. It has a low density and is a strong, lustrous, corrosion-resistant (including sea water, aqua regia and chlorine) transition metal with a silver color.
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Refractive Index Reference - D.W. Lynch, C. G. Olson, and J. H. Weaver, Phys. Rev. B 11, 3617 (1975)
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