DISPERSION

DISPERSION

The dispersion is the PROPERTY of a stone to break the white light that penetrates in the colors of the spectrum. This property is what causes the rainbow colors of the sky (the "lights" of a stone) is observed especially in Pierre colorless or those with high dispersion index: diamonds, zircon, dermatoid garnet, sphere, and sphalerite are the best examples.

Dispersion index of gems and minerals

Gem / Mineral	Index
almandine	024
andradite	057
Bénitoite	044
Beryl	014
beryllonite	010
cassiterite	071
chrysobery	l015
corundum	018
Danburite	016
Demantoid	057
Diamond	044
dioptase	022
Epidote	030
Euclase	016
Fluorite	007
grossular	028
Idiocrase	019
Peridot	020
pyrope	027
quartz	013
rhodolite	026
scapolite	017
Spessartite	027
Sphalerite	156
Sphene	051
Spinel	020
spodumene	017
glass	010
topaz	014
tourmaline	017
zircon	038