PHANTOM QUARTZ :

Variety of rock crystal presenting different superimposed zones of crystallisation as well as sometimes different colours.

PHANTOM TOURMALINE :

Term sometimes used to designate a transparent tourmaline with different zones of colour.

PHARMACOCHALCITE :

Synonym of olivenite.

PHASSACHAT :

German name. Agate coloured by leadoxides

PHENACITE :

Etym. from the Greek: phenax = misleading, originally wrongly thought to be a Quartz, hence it‘s name

B₂ [SiO₄]

Physical and optical properties:

- Colour : colourless, yellowish, greenish, pinkish, brownish, bluish

- Transparency : transparent

- Hardness : 7.5 to 8

- Density : 2.93 to 3.00

- R.I. : 1.654 – 1.670 (+0.026 –0.004)

- Birefringence : 0.016

- Dispersion : 0.009

- Uniaxial positive

- Pleochroism : distinct : colourless, yellow-orange

- System : trigonal

PHENAKITE :

Synonym for phenacite.

PHENGITE :

Transparent or translucent mineral that was used in classical times as windows ; or a variety of non gemmiferous muscovite .

PHLOGOPITE :

Variety of mica that one encounters frequently as an inclusion in gemstones.

KMg₃AlSi₃O₁₀(OH)₂

Physical and optical properties :

- Colour : yellow to brown, red to green, colourless, white

- Lustre : pearly

- Hardness : 2 to 2.5

- Density : 2.4 to 2.9

- System : monoclinic or hexagonal

PHONITE :

Synonym for nepheline.

PHOSPHORITE :

Variety of apatite.

PHOSPHOROCHALCITE :

Synonym for pseudomalachite.

PHOTICITE :

Variety of rhodoïd.

PHOTIZITE :

Synonym for pholiote.

PHTAMITE :

Synonym for Lydian stone .

PHTHANITE :

Black silex abounding in carboniferous limestone .

PHYSALITE :

Synonym for topaz .

PICOTINE :

Variety of dark green spinel .

PICOTITE :

Variety of spinel ; chromiferous and black of colour .

PICROEPIDOTE :

Variety of magnesium containing epidote .

PICROFLUITE :

Variety of serpentine.

PICROLITE :

Sub-variety of the chrysotile variety of serpentine, of grey to green colour .

PIDDINGSTONITE :

Meteoritic variety of anthophyllite or synonym of hyperstene.

PIEDMONTITE :

Synonym of piemontite.

PIEDRA ARBOL :

Spanish Name for mocha stone .

PIEDRA de AGUJA :

Spanish Name for sagenitic Quartz.

PIEDRA de CALMUCO :

Spanish Name for cacholong .

PIEDRA de CANELA :

Spanish Name for hessonite.

PIEDRA de IJADA :

Name of Spanish origin designating jade and jadeite .

PIEDRA de SIMAVA :

Spanish Name for fire opal .

PIEDRA SANGRA :

Spanish Name for hematite.

PIEMONTITE :

Etym. from Saint-Marcel in Piémont

variety of manganiferous epidote

- Colour : brown-red, cherry red, yellow-orange, yellow-citron, violet

- Hardness : 6.5

- Density : 3 to 4

PIERRE CELISE :

French. Used as a synonym for turquoise.

PIERRE d’AIGLE :

French for eagle stone .Synonym of aetite.

PIERRE d’ARGENTINE :

French. Used as a synonym of moonstone .

PIERRE d’AUVERGNE :

French. Variety of almost colourless chalcedony from Auvergne, France.

PIERRE d’AZUR :

French. Used as a synonym for lapis-lazuli.

PIERRE d’EAU :

French. Used as a synonym for a colourless water-worn topaz crystal.

PIERRE de BOUTEILLE :

French. Used as a synonym for moldavite .

PIERRE de CAMELEON :

French for cameleon stone. Used as a synonym of alexandrite or of  hydrophane.

PIERRE de CANELLE :

French. Used as a synonym for hessonite, equally employed wrongly for designating a yellow Quartz, natural or not.

PIERRE de CHRYSANTHEME :

French. Used as a synonym for Kikukwaseki.

PIERRE de CROIX :

French. Used as a synonym for staurotide.

PIERRE de FEE :

French. Used as a synonym for a staurotide or a twinned variety of staurotide .

PIERRE de FIGURE :

French. Used as a synonym for pagodite .

PIERRE de FOUDRE :

French. Name formerly given to a pyrite .

PIERRE de GALINACE :

French. Used as a synonym for an obsidian .

PIERRE de GILBRALTAR :

A kind of Onyx marble only slightly coloured, found at Gibraltar .

PIERRE de LABRADOR :

French. Used as a synonym for labradorite.

PIERRE de LARD :

French. Used as a synonym for lardite of ivory colour, veined or spotted with red or pink .

PIERRE de LUNE :

French for moonstone .

PIERRE de LUNE BLEUE :

French. Prohibited Appellation for a bluish chalcedony or for a blue tinted agate .

PIERRE de LYNX :

French. Synonym for dark blue cordierite .

PIERRE de MOCHA :

French for Mocha stone.

PIERRE de MOKA :

French. Synonym for pierre de Mocha .

PIERRE de MOUCHES :

French. Variety of white agate with very small inclusions of dendrites having the appearance of wings of flies ; in reality the stone is not agate but chalcedony.

PIERRE DES AMAZONES :

French. Used as a synonym of amazonite.

PIERRE de SANG :

French. Synonym of heliotrope or (French : jaspe sanguin) .

PIERRE de SAVON :

French for Soapstone. Synonym for saponite or synonym for steatite.

PIERRE DES AZTEQUES :

French. Used as a synonym for bonamite.

PIERRE de SIMOAS :

French. Synonym of fire opal (French : opale de feu ).

PIERRE des MARTYRS :

French. Synonym for heliotrope (in French = jaspe sanguin ).

PIERRE de SOLEIL :

French for Sunstone.

PIERRE de TOUCHE :

French. Synonym for Quartz lydien.

PIERRE de TURQUIE :

French. Old Synonym for turquoise.

PIERRE du DIABLE :

French for devil’s stone .

PIERRE du RHIN :

French. Synonym for caillou du Rhin.

PIERRE du TIBET :

Synonym of eosite, or variety of Quartz of a grey colour (Greyite) or of a brownish yellow colour (Leonite) ; or agglomerate of aventurine quartz and of porphyre quartz of variable colour .