Not required for students of EPS2. (Don't memorize this list!)

Dispersion values as a guide to gemstone or simulant identity

Fluorite.............. .007
Silica glass.......... .010
Beryllonite........... .010
Kyanite............... .011
Orthoclase feldspar... .012
Quartz................ .013
Topaz................. .014
Beryl................. .014
Phenakite............. .015
Chrysoberyl........... .015
Sillimanite........... .015
Euclase............... .016
Danburite............. .016
Datolite.............. .016
Scapolite............. .017
Tourmaline............ .017
Spodumene............. .017
Corundum.............. .018
Kornerupine........... .019
Idocrase.............. .019
Peridot............... .020
Spinel................ .020
Dioptase.............. .022
Almandite garnet...... .024
Rhodolite garnet...... .026
Pyrope garnet......... .027
Spessartite........... .027
Grossularite garnet... .028
Epidote............... .030
Zircon................ .038
Benitoite............. .044
Diamond............... .044
Sphene................ .051
Andradite............. .057
Cassiterite........... .071
Strontium titanate.... .109
Sphalerite............ .156
Synth. Rutile......... .330

These values from the compilation GEMSTONE