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Encyclopedia

A B C D E F G H I J K L M N O
P Q R S T U V W X Y Z

Pallasite Meteorite
See the gallery

Pallasite Esquel:
This pallasite was discovered in 1951 in esquel - Argentina.
It shows iron - nickel with large crystals of peridots.
This doens not exist on the Earth and can be see only in that type of mtorite.
See the gallery->

Pectolite:
Etymology : from the German geologist Kobell (1828). he mixed "pektos" freom Greak du Grec = something made with different pieces and "lithos" = stone. The pectolite is a secondary rock. The most well known variety is the Larimar.
The Pectolite is a mineral inosilicate hydroxide of calcium and sodium that crystallizes in the triclinic system, with the chemical formula NaCa2Si3O8(OH).

Peridot: ペリドットperidot ©gemfrance.com
The other names used for peridot are Chrysolite and Olvine.
The peridot is a family of gems coming for the Forsterite to the Fayalite .
Between it is the peridots.
The oldest mine known is Zeguibert in Egypt.
See the galleries. Peridot - Olivine from Pakistan and USA - and Peridot from Burma.

Peridot from météorite: Some crystals of peridots from the Pallasite from Esquel was enough bif to be cut in faceted gemstones. _ See the gallery-> Pétalite:
Etymologie : Due to its perfect cleavage, from Greek "petalon" = leaf
See the gallery

Pezzotaite: ラズベリル” (Jap.)
(Cs(Be2Li)Si6O18) pezzotaite ©gemfrance.com
It is a new species discoverd in 2002 in Ambotavita - Madagascar.
Etymology : from Pr Pezzota.
Pezzotaite has been discovered in November 2002. Only a dozen kilograms of gem rough were mined and the deposit appears nearly exhausted. Only a few stones have been faceted, more have been cut in cabochons. They show a deep pink color. Many stones contained numerous fine growth tubes. When abundant, they are responsible of a cat’s eye effect.

pezzotaite ©gemfrance.com

Previously, it has been announced as a cesium-rich beryl (Cs(Be2Li)Si6O18). But Pezzotaite is rhombohedral rather than hexagonal as the other beryls and the enriched Cs content gives rise to some of their properties, which permit a classification as a new species.
Hardness:7.5 IR: 1.61 / 1.62. S G: 3.10 Optic character: uniaxial negative; Chealsea filter reaction: faint orangy pink to pink-orange _ See the gallery.

Phenakite: Be2 Si O4
Etymology : From Greek "phenax" = cheater (looking like quartz).
See the gallery.

Pollucite:
Etymology : from Greek "Polux", Castor’s brother, because Pollucite is always with Castorite.
See the gallery.

Polysphaerite:
It is a very rare variety of Pyromorphyte coming from France, near Asprières (Aveyron).
Etymology : from his shape.
See the gallery.

Powellite: Ca MoO4

Powellite
Powellite

Etymology : from the US geologist J.P.POWELL (1834-1902).
Locality : Peacock Claim, sven devils dist., Adams Co., Utah, USA.

Prehnite: プリーナイト(Jap.)
Etymology : In honour of the collector H.Van Prehn.
See the gallery.

Pyrite: パイライト(Jap.)
Etymology : From Greek "purites lithos" = stone of fire.

Pyroxmangite:
Discovered by FORD et BRADLEY in 1913: Iva, South Caroline USA.
Etymology : Because the chemistry is close from PYROXENES adding manganese.

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