Talk:Chrysoberyl

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I would like to know why the stone changes colour? Is it because of the anmount of ultra-violet light, as would seem indicated by the differing light sources that case the changes?


203.132.65.100 (talk) 05:51, 15 March 2008 (UTC)
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[edit] Hola

HOLA!! —The preceding unsigned comment was added by 64.193.99.195 (talk • contribs) .

¡Hola! Si quieres leer o contribuir a Wikipedia en español, por favor va a es.wikipedia.org. —Keenan Pepper 18:16, 22 September 2006 (UTC)

[edit] Chrysoberyl Species and variety

Chrysoberyl is a mineral consisting of ordinary colorless or yellow transparent chrysoberyl, cymophane (chrysoberyl cat´s eye), and alexandrite.

Ordinary chrysoberyl is a yellowish-green, transparent to translucent chrysoberyl. Ordinary chrysoberyl has often been referred to in the literature as chrysolite due to the common olive color of many of its gems, but that name is no longer used in the gemological nomenclature. When the mineral exhibits good pale green to yellow color and is transparent, then it is used as a gemstone.

Alexandrite, a strongly pleochroic (dichroic) gem, will exhibit emerald green, red and orange-yellow colors and tend to change color in artificial light compared to daylight. The color change from red to green is due to strong absorption of light in the yellow and blue portions of the spectrum. Typically, alexandrite has an emerald green color in daylight but exhibit a raspberry red color in incandescent light.

Cymophane is popularly known as cat´s eye. This variety exhibits pleasing chatoyancy or opalescence that reminds one of an eye of a cat. When cut to produce a cabochon, the mineral forms a light-green specimen with a silky band of light extending across the surface of the stone. --GemShare 08:42, 25 January 2007 (UTC)

[edit] History addition

I moved the recent refernce to a citation of the added paragraphs. As detailed as the chapter was, it needed a citation to assist in the immediate verifiability of the change made. The linked website is interesting. Is it reliable and authority on this gemstone? SauliH 15:29, 25 January 2007 (UTC)


[edit] Alexandrite.net source

Yes, it's look pretty reliable source. Check bibliogrpahy of the chapters. Guide sponsors also the biggest alexandrite retailer.===


[edit] Nils Gustaf Nordenskjold or Count Lev Alekseevich Perovskii

SO, who actually discoverdd alexandrite? —The preceding unsigned comment was added by 217.41.236.83 (talk) 23:17, 3 February 2007 (UTC).