Talk:Chrysoberyl

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)

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)

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)

Alexandrite.net source

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

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).

Merged comment

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)

it's because of the structure of the crystal which changes the light travelling through each of its axes - a.k.a. pleochroism.

Ads in pictures

The pictures have adverts for some guys jewelry website. Not quite sure what to do about this?

Deleted them in the end... Lucaswilkins (talk) 08:00, 20 June 2008 (UTC)

Dubious etymology

In light of http://www.etymonline.com/index.php?term=diaphanous

diaphanes, from dia- "through" + phainesthai

I am a bit sceptical to the given etymology of diaphanite. 88.77.147.227 (talk) 05:27, 13 June 2009 (UTC)

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The dictionary on my mac suggests form Grrek diaphanēs, from dia ‘through’ + phainein ‘to show.’ Anonymous User —Preceding unsigned comment added by 88.217.127.162 (talk) 06:04, 29 July 2009 (UTC)

As someone who has studied ancient Greek, you both are correct. It is cognate with English "diaphanous" meaning "see-through." —Preceding unsigned comment added by 70.171.20.114 (talk) 19:59, 10 November 2010 (UTC)

I would like to know which of the Greek word means "spar". 142.163.195.205 (talk) 00:22, 20 November 2023 (UTC)

Spinel Group?

Chrysoberyl fits the spinel formula of AB2O4, A being bivalent and B trivalent; why is it never referred to as a member of the aluminum series of the spinel family? J S Ayer (talk) 03:38, 7 December 2010 (UTC)

Dunno -- does now. Vsmith (talk) 14:31, 7 December 2010 (UTC)

This afternoon I walked into a jewelry store, and happened to find the jeweler, a longtime member of the Gemological Institute of America, sitting peacefully on a stool; I asked him why chrysoberyl is not referred to as a member of the spinel group, and he replied that it is simply a matter of custom. J S Ayer (talk) 22:18, 25 May 2011 (UTC)

Spinel and spinel group minerals belong to the isometric (cubic) crystal system whereas chrysoberyl belongs to the orthorhombis crystal system. That's why it is wrong to put chrysoberyl into the spinel group. (Stenallan (talk) 22:21, 29 May 2014 (UTC)).

Discovered long before 1780s

Chrysoberyl or Cat's Eye, has been prescribed as an astrological remedy as early as 4000 years ago in the Vedic culture of India. Its not exactly fair to say it was just discovered in the 1780s, when its been known in human history for FAR longer... a simple web search can confirm this for anyone unfamiliar with Vedic Astrology and Gemology (use of gems to effect ones karmic outcome). BrightShadow (talk) 12:34, 5 October 2012 (UTC)

The cited references place the discovery at 1789 or 1790. Quite possibly this should be clarified as first scientifically described rather than discovered, however the source Mindat does say discovered. Rather obviously the gems were known prior to that, but not mineralogically described or classified. Vsmith (talk) 13:13, 5 October 2012 (UTC)

I decided to look into this a bit more. I'm not entirely sure what constitutes a "scientific description", but firstly it must be mentioned that the Vedic culture was highly scientific. They had figured out the earth was round, calculated the positions of the main planets, and their orbits so perfectly that their math holds up today. They were the inventors of whats known now as the Pythagorean therom (Pythagoras actually visited India and learned the equation from listening to cultural chants! but couldn't prove it mathematically so he released it as a theorm). All this before any other society on earth. I found this link which is an English translation of what they had to say about Chrysoberyl (http://www.agt-gems.com/Book/Gemlore/Catseye.html). It comes from a document known as Sri Garuda Puranam, (http://en.wikipedia.org/wiki/Garuda_Purana) which is from a set of works known as Smriti, which comes from 500AD (http://en.wikipedia.org/wiki/Smriti). Again i'm not sure if this counts, but either way its worthy of mention I believe. So often discoveries are mis-attributed (like with Pythagoras), and I feel its a mistake to be lazy about correcting them. BrightShadow (talk) 00:37, 6 October 2012 (UTC)

Citation

A lot of content and 2 out of 3 photos here are taken from Alexandrite.net ( http://www.alexandrite.net/chapters/) This article needs correct citations — Preceding unsigned comment added by 125.24.98.98 (talk) 18:35, 10 November 2012 (UTC)

Hexagonal?

The link to the Hexagonal crystal system is not appropriate. Although the apparence can be hexagonal the mineral belongs to the orthorhombic crystal system. The pre 20 April 2011 link to Hexagon is a better choice.Stenallan (talk) 22:21, 29 May 2014 (UTC)

One of the 9 jewels in indian astrology

Navaratna should be linked here Oligodynamism (talk) 11:16, 24 November 2020 (UTC)

Yellow chrysoberyl = cats eye gemstone which along with Hessonite garnet symbolizes the lunar nodes Oligodynamism (talk) 11:17, 24 November 2020 (UTC)

Non-jewelry applications eg tunable lasers

Seems Alexandrite is used for tunable laser crystals eg for LIDAR.[1] - Rod57 (talk) 01:42, 21 December 2021 (UTC)