Nephrite

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Physical & Optical Properties

Category Semi-Precious Gems

Mohs Hardness 6,0 – 6,5

Specific Gravity 2,9 – 3,1

Refractive Index 1,6 – 1,627

Crystal System Monoclinic

Cleavage None

Fracture Splintery

Color various

Birefringence 0,027

Pleochroism Nil

Mohs Hardness

Mohs hardness of Nephrite shown against the ten reference minerals, from talc (1) to diamond (10).

Mohs	Reference mineral	Nephrite
1	Talc
2	Gypsum
3	Calcite
4	Fluorite
5	Apatite
6	Orthoclase	●
7	Quartz
8	Topaz
9	Corundum
10	Diamond

Crystal System

Value & Market

Price Tier Moderate ($50-500/ct)

Where to Buy Nephrite

Blue Nile Fine jewelry retailer

James Allen Gemstone jewelry

Brilliant Earth Ethically sourced gems

Amazon Wide selection

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Treatments

Less commonly dyed than jadeite-jade because of its more compact structure, may be impregnated - Blue Chart Gem Identification, Herve Nicolas Lazzarelli, 2010, p 5 6 to 6.5Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references 2.90 to 3.10Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references BrittleWalter Schumann, Gemstones of the world (2001) NoneArthur Thomas, Gemstones (2009) SplinteryArthur Thomas, Gemstones (2009) 1.600 to 1.627Walter Schumann, Gemstones of the world (2001) More from other references Biaxial/-Arthur Thomas, Gemstones (2009) 0.027 to often moreWalter Schumann, Gemstones of the world (2001) More from other references NilArthur Thomas, Gemstones (2009) NilArthur Thomas, Gemstones (2009) YesUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) Green, gray-green, reddish-brown, blackUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references Translucent,OpaqueUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references NoneWalter Schumann, Gemstones of the world (2001) MonoclinicHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references FibrousHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references Occurs in serpentine rocks, and as river or beach pebbles.Walter Schumann, Gemstones of the world (2001) More from other references Nephrite information at mindat.org Australia  Nichol (2000) Canada  Nichol (2000) Nichol (2000) China  Italy  Nichol (2000) New Zealand  Switzerland  Nichol and Giess (2005) Taiwan  Adams and Beck (2009) USA  Paradise (1985) Ward (1999)

About Nephrite

Nefrite é uma das duas pedras minerais designadas jade (a outra é jadeíte), composta principalmente de actinolite fibrada. Com tonalidades que variam de verde-escuro a creme a branco, a nefrite é mais resistente à fractura do que a jadeíte devido à sua estrutura cristalina entrelaçada. A civilização chinesa valoriza a nefrite há mais de 8.000 anos como pedra de virtude. Frequentemente mais translúcida do que opaca, pode ser polida a alta qualidade. As principais fontes incluem a China (Xinjiang), Nova Zelândia, Rússia e Canadá. O Jade Branco de Khotan é considerado o mais precioso.

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