154 MINERAL RESOURCES, 1917----PART II.
Fortification agate=agate with parallel zigzag lines.
Fossil coral=coral replaced by silica (beckite).
Fossil pineapple=opal pseudomorph after glauberite, from New South Wales.
Fossil turquoise=bone turquoise.
Fowlerite=variety of rhodonite containing zinc.
Franklinite=black oxide of iron, manganese, and zinc.
Frost stone=translucent gray chalcedony with pure-white patches or tufts,
like snowfiakes, scattered through it, from the Mojave desert, Cal. Fuchsite=green muscovite (mica).
G.
Gadolinite=velvety-blaek silicate of yttrium, beryllium, iron, and other elements.
Gahnite=green zinc spinel.
Garnet=group
of silicate minerals. The species are: Almandite, silicate of aluminum
and iron; andradite. silicate of iron and calcium; grossularite,
silicate of aluminum and calcium; pyrope, silicate of aluminum and
magnesium ; spessartite, silicate of aluminum and manganese;
uvarovlte, silicate of chromium and calcium.
Garnierite=green hydrous silicate of nickel and magnesium.
Gem=cut and polished precious stone.
Gemstone=gem.
Geneva ruby=synthetic ruby made in Geneva, Switzerland.
Geyserite=siliceous deposit from a geyser.
Gibraltar stone=banded, mottled, or clouded carbonate of calcium.
Girasol=corundum
cat's-eye with a bluish, reddish, or yellowish reflection of light,
lighter in shade than the stone itself, which moves on the surface of
the stone like the lines of a starstone; also opal (see girasol opal);
also moonstone (feldspar).
Girasol opal=fire opal.
Glass=artiflcial noncrystallized substance composed of silica and several bases, notably an alkali and lead.
Glass agate=obsidian.
Goethite=hydrous oxide of iron.
Golconda diamond=diamond obtained from the regions watered by Krishna and Godavari rivers but polished in Golconda, India.
Gold=metallic element, often mounted as found, as a nugget.
Gold opal=opal which shows yellowish light over a large area.
Gold quartz=massive quartz inclosing gold.
Golden beryl=clear bright-yellow beryl.
Golden stone=greenish-yellow chrysolite (olivine).
Golden topaz=topaz of a golden-yellow color; also golden-yellow citrine (quartz).
Goldstone=aventurine.
An imitation of goldstone consists of glass witli included metal
filings (fraudulently sold as fire agate).
Gooseberry stone=brownish-green grossularite (garnet).
Goshenite=colorless, white, or bluish beryl from Goshen, Mass.
Goutte d'eau=colorless topaz.
Goutte de sang=blood-red spinel.
Graphic granite=pegmatite composed of quarts and feldspar so arranged as to simulate writing.
Green agate=zonochlorite.
Green garnet=any green garnet; also incorrectly applied to green enstatite from South Africa.
Green starstone=chlorastrolite.
Greenstone=zonochlorite; also chlorastrolite; also californite (vesuvianite).
Grossularite=pale-green or yellow garnet.
Guarnaccino=yellowish-red garnet. Same as vermeille.
Gypsum=hydrous sulphate of calcium.
H.
Hair stone=quartz with inclusions of hairlike crystals or fibers of some other
mineral. Same as sagsnite. Harlequin opal=opal in which- the colors form a minute mosaic or are set in
small squares. Hatchet stone=nephrite.
