nephrite from China marquise cabochon cut
nephrite
carved nephrite jade from Hetian in China
carved Bouddha in green nephrite
blue nephrite from Cowell in Australia
nephrite from Haulien in Taiwan, China
nephrite from Haulien in Taiwan, China
cut nephrite jade from China
nephrite artificially colored
nephrite from China marquise cabochon cut
nephrite
Detailed sheet
nephrite
This is a thick microcrystalline rock the of amphibole family, we can consider nephrite as a microcrystalline variety of ferrous actinolite-tremolite series.
The majority of nephrites are composed mainly of actinolite.
The white variety, known as” mutton fat “, is composed almost exclusively of tremolite, which gives it its white color because there is no iron inside to color it, while the most common varieties contain actinolite, which gives it the green color due to iron.
The chromium varieties are of an intense emerald-green color.
In Chinese nephrite was called “yu”, which means the most beautiful of stones, which has warm colors and a rich luster and is “the essence of heaven and earth”.
Throughout Asia, jade is a symbol of luck and health, it is offered for all occasions: births, weddings, birthdays, graduation and even to sign professional contracts.
CHEMICAL CHARACTERISTICS
Ca2(Mg,Fe)5[Si4O11]2 (OH)2
calcium, magnesium and iron silicate
PHYSICAL CHARACTERISTICS
Main color
green
Other colors
white, grey, yellow, black, orange
practically all the existing shades of color
Color of streak
white
Luster
greasy, vitreous
Hardness
6.0 to 6.5
Density
2.90 to 3.10
Cleavage
none
Fracture
splintery, uneven
shapes of very compact and resistant masses
OPTICAL PROPERTIES
Transparency
opaque, translucent
Refractive index
1.600 - 1.630
Double refraction
0.020
definite, biaxial (-)
visible double refraction
No
Pleochroism
absent
Number of colors
1
Absorption spectrum
589
difficult to observe at 509
Fluorescence
none
Inclusions
many: chromite, apatite, diopside, garnet, prehnite, vesuvianite, magnetite, graphite, pyrite ...
CRYSTALS PROPERTIES
microcrystalline fibrous and solid aggregates
crystals system
monoclinic
microcrystalline structure
OTHER INFORMATIONS
Astrological sign
Capricorn, Gemini, Leo, Libra
Chinese astrological sign
Dog, Dragon, Horse, Monkey, Ox, Pig, Rabbit, Rat, Rooster, Sheep, Snake, Tiger
APPROACHING GEMS
Exploited
sites
For nephrite, the deposits are more numerous than jadeite, the oldest ones being located in New Zealand in the South Island, called Jade Island, where it has always been popular with the Maori, in Khotan and Kashgar regions of China.
In the nineteenth century, Karl Faberge has much used a translucent nephrite with black inclusions coming from Russia.
The largest deposits currently in production are located in Canada (British Columbia), which produces 85% of the world production and sells mainly to China. Deposits are also in Australia (Tasmania, Cowel), Brazil, United States (Wyoming, Alaska, California, south of Carmel), New Guinea, Mexico, Russia (near Lake Bajkal in Siberia, whose production is exported to China), Taiwan, Zimbabwe …
In China high in the Kunlun Mountains in the region of Khotan in Xinjiang is extracted a jade called Helian that can be completely translucent white, it is the “ mutton fat “ variety, which was one of the most sought in China, the region of Lantian in Shaanxi has also given its name to some very famous nephrites.
Other
Gems
Venez visitez
notre site web
voillot-joaillier.fr
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