Birefringence Table


Mineral ...................Range of Values
Apatite................. .002-.006
Synth. Emerald (flux)... .003
Zircon (low)......approx .005
Beryl................... .005-.009
Danburite............... .006
Andalusite.............. .008-.013
Corundum................ .008
Topaz................... .008
Chrysoberyl............. .009
Quartz.................. .009
Beryllonite............. .010
Enstatite............... .010
Rhodonite............... .010
Jadeite................. .013
Kornerupine............. .013
Sillimanite............. .015-.021
Kyanite................. .015
Phenakite............... .016
Scheelite............... .016
Spodumene............... .016
Tourmaline.............. .018-.020+
Euclase................. .019
Brazilianite............ .019
Diopside................ .026
Peridot................. .036
Epidote................. .039
Sinhalite............... .039
Datolite................ .044
Benitoite............... .047
Dioptase................ .053
Zircon.......to......... .059
Cassiterite............. .096
Azurite................. .110
Sphene.................. .134
Calcite................. .172
Smithsonite............. .228
Malachite............... .250
Synth. Rutile........... .287
From the compilation GEMSTONE