ral which gives us peridot.
The name does not even suggest the color of these garnets correctly, as
they are seldom olive green in shade. As the scarcity of fine specimens
and their great beauty make a fairly high price necessary, the public
would hardly pay it for anything that was called "garnet," as garnets
are regarded as common and cheap. Perhaps the adoption of the name
"_Demantoid_" might relieve the situation. The stones are frequently
referred to as "demantoid garnets" on account of their diamond-like
luster and dispersion. The use of "demantoid" alone, if a noun may be
made from the adjective, would avoid both the confusion with the mineral
olivine, and the cheapening effect of the word garnet, and would at the
same time suggest some of the most striking properties of the material.

"_Spodumene_" furnishes pink to lilac "_Kunzite_," named after Dr.
George F. Kunz, the gem expert, and for a time an emerald green variety
was had from North Carolina which became known as "_Hiddenite_," after
its discoverer, W. E. Hidden. No confusion of naming seems to have
arisen in regard to this mineral.

The next mineral in the scale of hardness is quartz. (Hardness 7.) When
pure and colorless it should be called "_rock crystal_." Purple quartz
is of course _amethyst_. Some dealers have adopted a bad practice of
calling the fine deep purple amethyst "Oriental" amethyst, which should
not be done, as the term "Oriental" has for a long time signified a
_corundum_ gem. As Siberia has produced some very fine amethysts, the
term "_Siberian amethyst_" would be a good one to designate any
especially fine gem.

QUARTZ GEMS. We have already considered the naming of yellow quartz in
connection with topaz. "_Citrine quartz_" is probably the best name for
this material. If it is felt that the name "topaz" must be used, the
prefix "quartz" should be used, or perhaps "Spanish topaz" will do, but
some effort should be made to distinguish it from the true precious
topaz. In addition to amethyst and citrine quartz we have the pinkish,
milky quartz known as "_rose quartz_." This is usually correctly named.

"_Cat's-eye_" is a term that should be reserved for the Chrysoberyl
variety, and the quartz variety should always be called "quartz
cat's-eye." "_Tiger's-eye_" is a mineral in which a soft fibrous
material has been dissolved away, and quartz has been deposited in its
place. "_Aventurine quartz_" is the correct name for quartz containing