Table VI
Dichroism of Gem-Stones
(a) Strong
Corundum, tourmaline, alexandrite, spodumene, andalusite, iolite, epidote, axinite.
(b) Distinct
Emerald, topaz, quartz, peridot, chrysoberyl, enstatite, euclase, idocrase, kyanite, sphene, apatite.
(c) Weak
Beryl, diopside.