Image srdispersion.png gives a visual impression of the non-linearity of
refractive index with respect to wavelength.  The thicker lines
represent 700, 600, 500, and 400 nanometers, left to right.

Corundum (IOR_Ruby), topaz (IOR_Topaz), and quartz (IOR_Amethyst) have a
suspicious regularity to them.  I suspect Ive was working with
incomplete data for these.  Does anyone have better data?

Note that IOR_Sapphire in spectral_minerals.inc has dodgy IORs for 380
and 390 nm.  These wavelengths are nearly invisible to the human eye;
but if they are important to you, then use M_Gem (D_Sapphire, IOR_Ruby,
fade_distance) for sapphire instead of M_Sapphire, as ruby and sapphire
are essentially the same mineral, differing only by their impurities.

Image glass_survey.jpg is a render of the spectra of the glass materials
in SpectralRender.

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