Difference between revisions of "Jadeite"

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(G&G Articles on Jadeite 1934-1980)
(G&G Articles on Jade 1934-1980)
 
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*Smithsonian Handbooks, Gemstones, Second Edition 2002
 
*Smithsonian Handbooks, Gemstones, Second Edition 2002
  
== G&G Articles on Jadeite 1934-1980==
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== G&G Articles on Jade 1934-1980==
 
The GIA has published all the [http://www.gia.edu/research-resources/gems-gemology/back-issue-archive/index-back-issues-1934-80.html G&G's from 1934 until 1980 online]. The organization of the list by subject was done by [http://archive.org/details/GillsHistoricalIndexToGemsAndJewelryOnline-ByJosephO.Gill2009in Joseph Gill].  
 
The GIA has published all the [http://www.gia.edu/research-resources/gems-gemology/back-issue-archive/index-back-issues-1934-80.html G&G's from 1934 until 1980 online]. The organization of the list by subject was done by [http://archive.org/details/GillsHistoricalIndexToGemsAndJewelryOnline-ByJosephO.Gill2009in Joseph Gill].  
  
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</li><li>[http://www.gia.edu/research-resources/gems-gemology/back-issue-archive/fall-1979.pdf Fall 1979, <b>Clarification of Composition of Maw Sit Sit</b>, p. 217, 2p.]
 
</li><li>[http://www.gia.edu/research-resources/gems-gemology/back-issue-archive/fall-1979.pdf Fall 1979, <b>Clarification of Composition of Maw Sit Sit</b>, p. 217, 2p.]
 
</li><li>[http://www.gia.edu/research-resources/gems-gemology/back-issue-archive/summer-1980.pdf Summer 1980, <b>Australia Likely To Be Major Supplier of Jade</b>, by J. Stone, p. 331, 1p.]
 
</li><li>[http://www.gia.edu/research-resources/gems-gemology/back-issue-archive/summer-1980.pdf Summer 1980, <b>Australia Likely To Be Major Supplier of Jade</b>, by J. Stone, p. 331, 1p.]
</li></ul>
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</li>
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<li>[http://www.gia.edu/research-resources/gems-gemology/back-issue-archive/summer-1943.pdf Summer 1943, <b>So-called "Mexican jade" is calcite</b>, p. 87, 1p.]
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</li><li>[http://www.gia.edu/research-resources/gems-gemology/back-issue-archive/winter-1955.pdf Winter 1955,<b> Cat's-eye nephrite</b>, p. 238, 1p.]
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</li><li>[http://www.gia.edu/research-resources/gems-gemology/back-issue-archive/spring-1958.pdf Spring 1958, <b>Jadeite triplets</b>, p. 134, 3pp.]
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</li><li>[http://www.gia.edu/research-resources/gems-gemology/back-issue-archive/winter-1961.pdf Winter 1961, <b>Jadeite "Yunnan Jade" from Burma</b> (showing absorption spectrum), p. 242, 2pp.]
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</li><li>[http://www.gia.edu/research-resources/gems-gemology/back-issue-archive/spring-1963.pdf Spring 1962, <b>Rare gray-blue jadeite</b>, p. 283, 1p.]
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</li><li>[http://www.gia.edu/research-resources/gems-gemology/back-issue-archive/winter-1963.pdf Winter 1963, <b>Faded dyed jadeite</b>, p. 100, 2pp.]
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</li><li>[http://www.gia.edu/research-resources/gems-gemology/back-issue-archive/summer-1965.pdf Summer 1964, <b>Stable color in dyed jadeite</b>, p. 181, 1p.]
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</li><li>[http://www.gia.edu/research-resources/gems-gemology/back-issue-archive/winter-1965.pdf Winter 1965, <b>Dyed nephrite first seen at the GIA</b>, p. 363, 2pp.]
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</li><li>[http://www.gia.edu/research-resources/gems-gemology/back-issue-archive/winter-1965.pdf Winter 1965, <b>A new type of jadeite triplet (two pieces of jadeite, green coloring in center)</b>, p. 369, 2pp.]
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</li><li>[http://www.gia.edu/research-resources/gems-gemology/back-issue-archive/winter-1967.pdf Winter 1967, <b>Dyed jadeite</b>, p. 245, 1p.]
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</li><li>[http://www.gia.edu/research-resources/gems-gemology/back-issue-archive/summer-1969.pdf Summer 1969, <b>Glass jade imitation</b>, p. 58, 2pp.]
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</li><li>[http://www.gia.edu/research-resources/gems-gemology/back-issue-archive/winter-1970.pdf Winter 1970, <b>Glass-like jade imitation</b>, p. 249, 3pp.]
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</li><li>[http://www.gia.edu/research-resources/gems-gemology/back-issue-archive/summer-1971.pdf Summer 1971, <b>Dyed lavender jadeite</b>, p. 323, 2pp.]
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</li><li>[http://www.gia.edu/research-resources/gems-gemology/back-issue-archive/summer-1972.pdf Summer 1972, <b>Jade substitute (glass)</b>, p. 44, 2pp.]
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</li><li>[http://www.gia.edu/research-resources/gems-gemology/back-issue-archive/summer-1972.pdf Summer 1972, <b>Jade-like minerals</b>, p. 50, 3pp.]
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</li><li>[http://www.gia.edu/research-resources/gems-gemology/back-issue-archive/fall-1972.pdf Fall 1972, <b>Distinguishing burial jade from burned jade not yet possible</b>, p. 83, 2pp.]
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</li><li>[http://www.gia.edu/research-resources/gems-gemology/back-issue-archive/fall-1972.pdf Fall 1972, <b>Paraffin-treated jade</b>, p. 84, 2pp.]
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</li><li>[http://www.gia.edu/research-resources/gems-gemology/back-issue-archive/fall-1972.pdf Fall 1972, <b>Blue jade-like material (tremolite)</b>, p. 91, 2pp.]
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</li><li>[http://www.gia.edu/research-resources/gems-gemology/back-issue-archive/fall-1972.pdf Fall 1972, <b>A cat's-eye yellow jadeite</b>, p. 93, 1p.]
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</li><li>[http://www.gia.edu/research-resources/gems-gemology/back-issue-archive/winter-1972.pdf Winter 1972, <b>Testing dyed antique replicas of j</b>ade, p. 112, 1p.]
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</li><li>[http://www.gia.edu/research-resources/gems-gemology/back-issue-archive/winter-1972.pdf Winter 1972, <b>Jade cat's-eye (?),</b> p. 113, 1p.]
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</li><li>[http://www.gia.edu/research-resources/gems-gemology/back-issue-archive/spring-1973.pdf Spring 1973, <b>Jade imitations in devitrified fibrous glass (meta jade, Imori stone)</b>, p. 134, 2pp.]
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</li><li>[http://www.gia.edu/research-resources/gems-gemology/back-issue-archive/summer-1973.pdf Summer 1973, <b>Durability of jadeite vs. nephrite</b>, p. 175, 2pp.]
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</li><li>[http://www.gia.edu/research-resources/gems-gemology/back-issue-archive/fall-1973.pdf Fall 1973, <b>Treated lavender jadeite</b>, p. 214, 2pp.]
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</li><li>[http://www.gia.edu/research-resources/gems-gemology/back-issue-archive/fall-1974.pdf Fall 1974, <b>Unevenly dyed jadeite</b>, p. 350, 1p.]
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</li><li>[http://www.gia.edu/research-resources/gems-gemology/back-issue-archive/spring-1975.pdf Spring 1975, <b>A "meta jade" glass with spectrum of natural jadeite</b>, p. 27, 2pp.]
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</li><li>[http://www.gia.edu/research-resources/gems-gemology/back-issue-archive/fall-1975.pdf Fall 1975 <b>Rare, nearly transparent, light gray faceted jadeite</b>, p. 73, 2pp.]
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</li>
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</ul>

Latest revision as of 17:12, 20 August 2012

Jadeite
Chemical composition NaAl(SiO3)2
Crystal system Monoclinic
Habit Polycrystalline
Fracture Flintery
Hardness 6.5 -7
Specific gravity 3.30 - 3.37
Lustre Greasy to vitreous

Jadeite is made up of interlocking pyroxene crystals. It occurs in a vary wide range of colors like green, lilac, white, pink, brown, red, blue, black, orange and yellow. The most prized color is a rich emerald green and is called Imperial Jade. Its green color is due to its chromium content and can be distinguished with a Chelsea (jadeite) filter. Jadeite is believed to prevent/cure hip and kidney ailments.

Enhancements

Common enhancements to jadeite:

  • Fracture filling - wax - conceal cracks and fractures
  • Coatings - wax - to improve luster
  • Staining - color improvement through dyes
  • Bleaching - removes stains
  • Polymer impregnation - improves luster and to stabilize piece after bleaching

Occurrence

The most important source of jadeite is Myanmar but Guatemala, Japan and the USA (California) are also important sources

Sources consulted

  • Smithsonian Handbooks, Gemstones, Second Edition 2002

G&G Articles on Jade 1934-1980

The GIA has published all the G&G's from 1934 until 1980 online. The organization of the list by subject was done by Joseph Gill.