The mineral graphite is an allotrope of carbon. It was named by Abraham Gottlob Werner in 1789 from the Ancient Greek ""to draw/write"", for its use in pencils, where it is commonly called lead (not to be confused with the metallic element lead). Unlike diamond (another carbon allotrope), graphite is an electrical conductor, a semimetal. Graphite is the most stable form of carbon under standard conditions. ",

For a typical sample of Graphite the refractive index and extinction coefficient at 632.8 nm are 2.7 and 1.39. 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 - Filmetrics Composite

No guarantee of accuracy - use at your own risk.