Difference between revisions of "Jadeite"

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(Addition from Robert Biehl (id:432))
(Sources consulted)
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==Sources consulted==
 
==Sources consulted==
 
*Smithsonian Handbooks, Gemstones, Second Edition 2002
 
*Smithsonian Handbooks, Gemstones, Second Edition 2002
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== G&G Articles on Jadeite 1934-1980==
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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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<ul><li>[http://www.gia.edu/research-resources/gems-gemology/back-issue-archive/Mar-Apr-1934.pdf March-April 1934, <b>Jadeite thought found in America (Oregon)</b>, p. 54, 1p.]
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</li><li>[http://www.gia.edu/research-resources/gems-gemology/back-issue-archive/May-June-1934.pdf">May-June 1934, <b>Jade</b>, p. 80, 3pp.</a>
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</li><li>[http://www.gia.edu/research-resources/gems-gemology/back-issue-archive/May-June-1934.pdf May-June 1934, <b>Red Jade, by M. Ehrmann</b>, p. 84, 1p.]
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</li><li>[http://www.gia.edu/research-resources/gems-gemology/back-issue-archive/fall-1944.pdf Fall 1944, <b>Nephrite found in Lander</b>, Wyo., in 1936, p. 170, 1p.]
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</li><li>[http://www.gia.edu/research-resources/gems-gemology/back-issue-archive/fall-1948.pdf Fall 1948, <b>Jade Carving in China</b>, p. 82, 5pp.]
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</li><li>[http://www.gia.edu/research-resources/gems-gemology/back-issue-archive/spring-1950.pdf Spring 1950, <b>Jadeite and nephrite found in Calif</b>., p. 289, 1p.]
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</li><li>[http://www.gia.edu/research-resources/gems-gemology/back-issue-archive/summer-1951.pdf Summer 1951, <b>Jadeite and nephrite found in Calif., and artifacts</b>, p. 76, 3pp.]
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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.]
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</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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<ul><li>[http://www.gia.edu/research-resources/gems-gemology/back-issue-archive/fall-1954.pdf Fall 1954, p. 67, 11pp.]
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</li></ul>

Revision as of 16:52, 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.