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Tungsten, also known as wolfram.
For a typical sample of W the refractive index and extinction coefficient at 632.8 nm are 3.63739 and 2.916877. Below are files of complete refractive index and extinction coefficients. If the file is not available for download, you can request our proprietary file by clicking "Request".
Refractive Index Reference - J. H. Weaver, C. G. Olson, and D. W. Lynch, Phys. Rev. B 12, 1293 (1975) and B. L. Henke, P. Lee, T. J. Tanaka, R. L. Shimabukuro, and B. K. Fujikawa, At. Data Nucl. Data Tables 27, 1 (1982)
No guarantee of accuracy - use at your own risk.
Tab-delimited data file for unrestricted use: