Difference between revisions of "Jadeite"
From The Gemology Project
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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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Revision as of 16:53, 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.
- March-April 1934, Jadeite thought found in America (Oregon), p. 54, 1p.
- [http://www.gia.edu/research-resources/gems-gemology/back-issue-archive/May-June-1934.pdf">May-June 1934, Jade, p. 80, 3pp.</a>
- May-June 1934, Red Jade, by M. Ehrmann, p. 84, 1p.
- Fall 1944, Nephrite found in Lander, Wyo., in 1936, p. 170, 1p.
- Fall 1948, Jade Carving in China, p. 82, 5pp.
- Spring 1950, Jadeite and nephrite found in Calif., p. 289, 1p.
- Summer 1951, Jadeite and nephrite found in Calif., and artifacts, p. 76, 3pp.
- Spring 1952, Jade in Mexico, p. 147, 5pp.
- Summer 1954, The Nature of Jade, p. 38, 9pp.