156 MINERAL RESOURCES, 1917—PART II.
Jadeite=greenish
silicate of aluminum and sodium (pyroxene). Jager=bluish-white diamond
of modern cut. Originally referred to diamond
from
the Jagersfontein mine, South Africa. Jargon=white or grayish-white
zircon. Jargoon=jargon. Jasp agate=intermediate between jasper and
chalcedony with predominant
opaque jasper. Jasper=massive quartz, impure and opaque, containing more iron oxide than
agate.
Jasper opal=deeply colored opal with many included impurities.
Jasperine=banded and variously colored jasper. Jet=pitch-black or
velvet-black coal sufficiently hard and compact to receive a
brilliant polish. Job's tears=local name for peridot from Arizona and New Mexico; also hyalo-
siderite, a rich olive-green olivine.
K.
Kashmir sapphire=cornflower-blue corundum.
Keystoneite=blue chrysocolla or chalcedony colored by copper silicate.
Kidney stone=nephrite.
King topaz=clear pink, orange, red, yellow, or flesh-colored corundum.
Kinradite=jasper with spherulites of quartz, from the region around San Francisco, Cal.
Kornerupine=silicate of aluminum and magnesium.
Kunzite=transparent lilac spodumene.
Kyanite=silicate of aluminum.
L.
Labrador feldspar=labradorite.
Labrador hornblende=hypersthene.
Labrador spar=labradorite.
Labrador stone=labradorite.
Labradorite=feldspar, silicate of alumium, sodium, and calcium.
Lake George diamond=clear quartz crystal from Herkimer, N. Y.
Lake Superior greenstone=chlorastrolite.
Lapis
lazuli=rock composed essentially of the minerals lazurite, haiiynite,
scapolite, calcite, pyroxene, amphibole, mica, and feldspar.
Lava=volcanic rock.
Lavendine=amethyst (quartz).
Lazulite=blue hydrous phosphate of aluminum, iron, and magnesium.
Lazurite=blue silicate of aluminum, calcium, and sodium, with the sulphate radicle.
Lechosos opal=opal showing deep-green flashes of color or specked with green and carmine; also used for milky opal.
Leelite=deep flesh-red orthoclase, having a waxy luster.
Lennilite=greenish feldspar from Lenni Mills. Delaware County, Pa.
Leopardite=rock (porphyry) with black spots of oxide of manganese.
Lepidolite=mica, hydrous silicate of aluminum, lithium, and potassium, with fluorine.
Lenco sapphire=wbite sapphire.
Lignite=brown coal showing the form and fiber of the original tree.
Lintonite=zeolite, probably thomsonite, with alternating bands of green and red.
Lithia emerald=green spodumene.
Lithoxyle=wood opal showing woody structure.
Lodestone=magnetite (oxide of iron) which shows polarity.
Love arrows=sagenite (quartz).
Lucky stone=fairy stone (staurolite).
Lumachelle=fire marble.
Lydian stone=basanite (quartz).
Lynx sapphire=water sapphire (cordierite) ; also vary dark blue sapphire.
Lynx stone=cordierite.
M.
Macle=chiastolite.
Madeira topaz=citrine (quartz).
Magic stone=hydrophane.
Magnetite=black magnetic oxide of iron.
