Aehirite=dioptase from Siberia.
Achroite=colorless or white tourmaline.
Actinolite=green silicate of iron, calcium, and magnesium (amphibole).
Adamantine spar=hair-bro\vn corundum.
Adelaide ruby=blood-red pyrope (garnet) from South Africa.
Aeroides=pale sky-blue beryl.
Agalmatolite=compact mica (hydrous silicate of aluminum and potassium);
compact pyrophyllite (hydrous silicate of aluminum). Agate=variegated
chalcedony. Agate jasper=intermediate between jasper and chalcedony
chalcedony; jasper with bands of chalcedony. Agrite=brown, mottled,
calcareous stone. Alabandine ruby=red spinel of a violet tint.
Alabaster=white, fine-grained gypsum; also incorrectly applied to
and pure-white stalagmites of aragonite. Alalite=diopside. Alaska diamond=quartz.
of aluminum and sodium (feldspar). Albite moonstone=iridescent albite.
Alencon diamond=quartz crystal from Alencon, France. Aleppo stone=eye
agate. Alexandrite=emerald-green to dark-green chrysoberyl which
changes in color
to a columbine-red by artificial light. Allanite=l)lack hydrous silicate of aluminum, magnesium, cerium, and iron
and other elements. Almandite (almandine) =columbine-red, or a deep crimson and violet garnet,
silicate of aluminum and iron. Almandine spinel=violet-red spinel Alpine diamond=pyrite.
blue-green, and bluish variscite cut with its associated matrix. Amazon
stone=green microcline feldspar, silicate of aluminum and potassium
Amber opal=opal colored brown by iron oxide.
agate from the Death Valley region, Cal. Ambroid=small pieces of
inferior amber fused together. American jade=caIifornite (vesuvianite).
American ruby=blood-red garnet, mostly pyrope. Amethiste basaltine=pale
violet or reddish beryl. Amethyst=purple and bluish-violet quartz, in
quartz=quartz of an amethyst color, not necessarily in crystals.
Amphibole=group of minerals, silicates of aluminum, iron, calcium,
and other elements. Anatase=oxide of titanium. Another name for octahedrite. Ancona ruby=quartz.
of aluminum; also trade name for brown tourmaline. Andesine=silicate of
aluminum, sodium, and calcium (feldspar). Andradite=garnet, silicate of
iron and calcium. Anthracite=hard iron-black coal, harder than jet or
cannel coal. Apatite=phosphate of calcium, with fluorine.
silicate of calcium and potassium. Apricotine=yellowish-red quartz
pebbles from vicinity of Cape Stay, N. J. Aquamarine=light bluish-green
or sea-green beryl. Aquamarine chrysolite=greenish-yellow beryl.
Aquamarine topaz=greenish topaz.
of calcium, in orthorhombic crystals. Arizona ruby=deep-red pyrope
(garnet) from Arizona and Utah. Arizona spinel=deep-red pyrope (garnet)
from Arizona and Utah. Same as
Arizona ruby. Arkansas diamond=diamond from Arkansas; also quartz crystals from
Arkansas. Arkansite=brilliant iron-black, opaque brookite, oxide of titanium.