Oriental jasper=bloodstone (quartz).
Oriental lapis=lapis lazuli.
Oriental moonstone=pearly corundum.
Oriental onyx=banded, mottled, or clouded stalagmites (aragonite).
Oriental opal=Hungarian opal carried to the Orient by merchants and then
shipped
back to Europe. Oriental peridot=green corundum. Oriental sapphire=(in
part) blue corundum. Oriental smaragd=green corundum. Oriental
sunstone=girasol (corundum). Oriental topaz=yellow corundum. Oriental
turquoise=turquoise. OrthocIase=potash feldspar in monoclinic crystals,
silicate of aluminum and
potassium.
Orthose=moonstone (feldspar). Ouachita stone=novaculite (whetstone) ;
quartz. Ouvarovite=emerald-groen garnet colored by chromium.
Ox-eye=labradorite (feldspar).
P.
Pagoda stone=agalmatolite.
Pagodite=agalmatolite.
Paphos diamond =quartz.
Parisite=carbonate of cerium and other rare elements, with fluorine.
Paste=artiflcial lead glass used to imitate gems.
Paulite=hyperstene.
Pealite=opal-like variety of geyserite (silica).
Pearl=lustrous
calcareous concretion with animal membrane between successive layers,
deposited in the shells of various mollusks. Not a mineral but an
animal product.
Pearlite=obsidian with spherulites.
Pearlylite=variety of obsidian.
PebbIe=rock crystal (quartz).
Pecos diamond =quartz from Pecos River, Texas.
Pectolite=hydrous silicate of calcium and sodium.
Pegmatite=coarsely grained rock composed of quartz and feldspar.
Pelhamite=variety of serpentine.
PeIiom=cordierite.
Pennsylvania diamond = iron pyrite.
Peridot of Ceylon=Same as Ceylon peridot, honey-yellow tourmaline.
Peridot=olivine. (See olivine).
Peristerite=iridescent albite (feldspar).
Persian lapis=lapis lazuli.
Perthite=potash feldspar (orthoclase or microcline) with laminae of soda feldspar (albite).
Peruvian emerald=the best emeralds from Muzo, Colombia.
Petoskey agate=cemented portions of fossil coral (beckite).
Petrified honeycomb=beckite.
Petrified wood=wood replaced by silica.
Phenacite=silicate of beryllium.
Phenomenal gem=one which shows a play or change of color by artificial light, or shows a movable line of light.
Piedmontite=brownish-red variety of epidote.
Pin fire opal=opal in which the area of the individual colors is very small.
Pink topaz=topaz either naturally pink, or artificially colored pink by heating the yellow or brown varieties.
Pink wollastonite=lilac-colored pyroxene (diopside) from the region of San Francisco, Cal.
Pipestone=catlinite (compact red clay).
Pisolite=concretionary massive limestone, similar to oolite but made up of larger spherical grains.
Pistacite=greenish epidote.
Pitch opal=brown opal with a pitchy luster.
Pitchstone=obsidian of a pitchy luster.
PIasma=massive
translucent quarts, dark grass-green in color, sometimes with white or
yellow inclusions of celadonite or of delessite.
Pleonaste=black spinel.
