Difference between revisions of "Jadeite"

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(G&G Articles on Jadeite 1934-1980)
(G&G Articles on Jadeite 1934-1980)
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</li><li>[http://www.gia.edu/research-resources/gems-gemology/back-issue-archive/spring-1952.pdf Spring 1952, <b>Jade in Mexico</b>, p. 147, 5pp.]
 
</li><li>[http://www.gia.edu/research-resources/gems-gemology/back-issue-archive/spring-1952.pdf Spring 1952, <b>Jade in Mexico</b>, p. 147, 5pp.]
 
</li><li>[http://www.gia.edu/research-resources/gems-gemology/back-issue-archive/summer-1954.pdf Summer 1954, <b>The Nature of Ja</b>de, p. 38, 9pp.]
 
</li><li>[http://www.gia.edu/research-resources/gems-gemology/back-issue-archive/summer-1954.pdf Summer 1954, <b>The Nature of Ja</b>de, p. 38, 9pp.]
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</li><li>[http://www.gia.edu/research-resources/gems-gemology/back-issue-archive/fall-1956.pdf Fall 1956, <b>Jadeite from San Benito County, Calif.,</b> p. 331, 4pp.]
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</li><li>[http://www.gia.edu/research-resources/gems-gemology/back-issue-archive/fall-1960.pdf Fall 1960, <b>Jade Cutting Today</b>, p. 81, 9pp.]
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</li><li>[http://www.gia.edu/research-resources/gems-gemology/back-issue-archive/winter-1964.pdf Winter 1964, <b>"Pigeon eye" nephrite from Wyoming</b> (shows chatoyant spots), p. 251, 2pp.]
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</li><li>[http://www.gia.edu/research-resources/gems-gemology/back-issue-archive/summer-1966.pdf Summer 1966, <b>Taiwan jade (nephrite)</b>, p. 62, 1p.]
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</li><li>[http://www.gia.edu/research-resources/gems-gemology/back-issue-archive/spring-1976.pdf Spring 1976, <b>Jade, China's Contribution to Fine Art</b>, by A. Alexander, p. 145, 8pp.]
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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.]
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</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>
 
</li></ul>

Revision as of 16:57, 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 Jadeite 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.