solid like inclusions : chromite crystal
peridot
peridot crystals from Pakistan
peridot crystals from Pakistan
cushion cut peridot from Pakistan
brilliant cut peridot from Burma
cut fosterites from Tajikistan
peridot from Pakistan with needle – like inclusions of ludwigite
peridot crystal from Burma
peridot crystal from the red sea in Egypt
type inclusion – (curved striae ) ? – ( swirl marks ) ? around a chromite crystal
solid like inclusions : chromite crystal
peridot
Detailed sheet
peridot
Formerly this mineral was called chrysolite, although the “chrysolitus” of Pliny was probably referred to topaz, a “yellow stone”, a “golden stone”. Also called ” stones of knights ” because it would be the crusaders who brought peridot from the east to europe where it has been used to enrich the religious objects before being appreciated later as a gem.
The peridot is one of a series minerals which are silicates of magnesium and iron whose extremes are: Forsterite, a magnesium silicate without iron, sometimes called “white peridot” because often colorless or slightly tinted, and Fayalite, which is the variety with iron (its refractive index can reach 1.77).
The olivine, and its gem variety, the peridot, contain about 80% magnesium and 20% iron. The Peridot is a valued stone when it is of a beautiful lime green, it is also a constituent of certain meteorites (pallasites).
Dunilite is the trade name for a variety of the olivine group containing manganese, discovered in the late 1990s in the region of Kolonne in Sri Lanka. It owes its name to Dunil Palitha Gunasekera, its refractive indices, birefringence and density are higher than most peridot gemstones and it’s more dichroic.
CHEMICAL CHARACTERISTICS
(Mg,Fe)2[SiO4]
iron - magnesium silicate
PHYSICAL CHARACTERISTICS
Main color
green
Other colors
yellow
lime-green clear to dark olive-green or brown
Color of streak
white
Luster
greasy, vitreous
Hardness
6.5 to 7.0
Density
3.27 to 3.48
Cleavage
indistinct
Fracture
conchoidal
difficult cleavage in one dimension.
OPTICAL PROPERTIES
Transparency
transparent
Refractive index
1.648 - 1.705
Double refraction
0.032
definite, biaxial positive
visible double refraction
Yes
Dispersion
0.020(0.012)
Pleochroism
very weak
Number of colors
3
colorless to pale green, green, olive green
Absorption spectrum
497 - 495 - 493 - 473 - 453
peridot spectrum system
Fluorescence
none
CRYSTALS PROPERTIES
prisms in groups, massive, elongated or tabular, flattened on one of the prisms.
crystals system
orthorhombic
OTHER INFORMATIONS
Astrological sign
Aries, Capricorn, Leo, Scorpio
Month
august
Chinese astrological sign
Monkey
APPROACHING GEMS
Exploited
sites
The deposits are quite extended, but very few give crystals of large size and quality : less than fifty locations are found worldwide.
The volcanic island of Zerbiget or Zabargad, which means peridot in arabic, (former Topazios, east of Egypt, or St. John’s Island) was exploited 3500 years ago, by the Pharaos. After being forgotten, it was “rediscovered” by some pirates, then again forgotten, until it became active again in 1900 and after abandoned again.
Some beautiful stones come from Burma, but also Norway, Russia (Urals, the Kola Peninsula), South Africa, Kenya, Tanzania, Australia (Queensland), Brazil (Minas Gerais), United States (Arizona), Mexico, Pakistan ( Suppatt mine or Suppet or Sapat), Sri Lanka, China, Afghanistan …
Other
Gems
Venez visitez
notre site web
voillot-joaillier.fr
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