turquoise
rough turquoise from Nishapur in Iran
cabochons of turquoise from Nishapur in Iran on little sticks
turquoise of iran mounted as ring
natural turquoise from Iran
turquoise from Mongolia
turquoise on ancient Tibetan jewel
polished Iranian turquoise
turquoise cabochon from Nishapur iran
Detailed sheet
turquoise
This is simply the “Turkish stone” because when this gem came to Europe, it had passed through that country, but it came from Persia. The Greeks called it “callaite”.
It was a sacred stone for the Egyptians, Persians, Tibetans, Indians, Mayans, Aztecs and Incas.
Color sky blue, green, apple green when it is altered, the nuance ” turquoise blue ” is proving rare. When the stone is cut by veinlets or brown clouds, or gray or black, it is called “matrix”.
Heated to 250 ° C, the blue sky color turns green. It may also change color under the influence of light, perspiration, oils, cosmetics, greasy products … by loosing its natural water content: it is said that she dies: it fades or turns green.
Its hardness depends on its origin: it starts at 4 (those of America), 5 (those of Sinai) or 6 (those of Persia). The turquoise of Iran are the most popular.
The Eilat stone is a mixture of malachite, chrysocolla, azurite and turquoise.
CHEMICAL CHARACTERISTICS
CuAl6[PO4]4(OH)8 - 4H2O
hydrated aluminum and copper phosphate
PHYSICAL CHARACTERISTICS
Main color
blue
Other colors
green
light blue sometimes with small brown or black veins
Color of streak
white
Luster
dull, waxy
Hardness
4.0 to 6.0
Density
2.30 to 2.85
Cleavage
none
Fracture
conchoidal, uneven
OPTICAL PROPERTIES
Transparency
opaque
Refractive index
1.610 - 1.650
Double refraction
0.040
strong biaxial (+)
visible double refraction
No
Dispersion
+
Pleochroism
absent
Number of colors
1
practically impossible to see
Absorption spectrum
432
turquoise spectrum system
Fluorescence
weak
greenish or bluish
Inclusions
limonite, quartz, pyrite veins of matrix
CRYSTALS PROPERTIES
rare, rather found in reniform aggregates or hummocky.
crystals system
triclinic
OTHER INFORMATIONS
Astrological sign
Aquarius, Capricorn, Gemini, Pisces, Taurus, Virgo
Month
december
APPROACHING GEMS
Exploited
sites
It occurs as veinlets of 20 to 25 mm only, in a compact mass filling cracks. The region of Nishapur (Iran) provides the most beautiful stones, but they are also found in Afghanistan, Argentina, Tibet, United States (New Mexico, Arizona: Sleeping Beauty Mine), Russia, Chile, Australia, Brazil, Indochina, in South West Africa, China, Mexico, Tanzania, Israel (in the Sinai were the site was operated in 4000 BC) and was even noted in France, at Montebras (Creuse) although it is likely that it was only variscite.
use in jewelry
The finest come from Iran and Egypt (Sinai), they are the most polished and have the most beautiful color and the highest hardness. Cut in cabochon for rings, pendants, necklaces and small objects for windows, in square for mosaics (Central America), to adorn weapons, clothing, vases (in Iran, a cup is decorated with 25 rows of turquoise), or even make coffee services or hookahs.
Turquoise is the anniversary stone for the 11th year of marriage.
Daily care
and precautions
Very fragile, sensitive to household products, greases, detergents, cosmetics, heat, dehydration. The porous turquoises, of low hardness, are the most fragile … it’s also one of the reasons why the Iranian turquoise are the most popular. The gemologist must refrain from wanting to measure the refractive index due to optical liquid.
imitations and
treatments
The porous stones are plastic impregnated to consolidate and strengthen their color. The Egyptians already imitated the stone with the earthenware covered with a porcelain enamel. We can enhance its color with oil or paraffin, Prussian blue, blue of aniline …
The most common imitations are magnesite, howlite, chalcedony and powders of limestone, turquoise, various phosphates, colored. Glassware, porcelain … can imitate it.
It was synthesized in a very untrustful way in the 1970s.
The Neolite (trade name) is sold for a synthetic turquoise matrix.
Historical
healing properties
Since prehistoric times, it was supposed to protect warriors and hunters by making them invincible being the emblem of courage, hope, self confidence, elevating the spirit to heaven and governing body fluids. Its quiet and intense color, which combines the blue sky and green earth, would relate our inspiration and our ideals to the primordial force of the planet, offering wisdom.
It would help us express our ideas and strengthen the scope of our words. It would improve stuttering. In Persia, it was wore to protect themselves from poverty and obtain the friendship of others.
It would have a regenerative action for the whole body, it departs the nightmares, preserve poisoners and murderers, sailors from shipwrecks. It is said that it “wastes away” along with the wearer, changing color, it is tarnishing and breaks at the time of death.
It will permeate our lives, would be the image of it.. it behaves like a sponge, a kind of absorbing shield.
Other
Gems
Venez visitez
notre site web
voillot-joaillier.fr
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