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Fakes & FraudsIs this really alexandrite?
22nd Jun 2018 20:48 UTCNick Gilly
[img]https://i.ebayimg.com/images/g/UgwAAOSwkIBbK0nj/s-l1600.jpg[/img]
He has 3 pieces for sale at present, and this is typical, a fairly large anhedral/massive lump of bluish-green translucent material. It seems odd that there's no demonstration of colour-change that I'd expect if it really was alexandrite. It could just as easily be apatite.
Who knows though, it could be a genuine new find from a deposit in China! Thoughts anyone?
22nd Jun 2018 21:44 UTCOwen Lewis
I bought my first 'alexandrite in Singapore in 1969 as a present for my mother. I still remember the chinese merchant kindly showing me how to prove it was alexandrite by observing the colour change between illumination with his shop lighting and the sunshine out in the street. What he did not tell me was that it was colour change synthetic corundum (verneuil process). So I didn't get the super bargain that I thought I was getting.
22nd Jun 2018 21:50 UTCNick Gilly
I think the off-colour patch is just a different mineral inclusion, possibly coloured by a bit of iron. Here's the link to the auction:
https://www.ebay.com/itm/Alexandrite-RARE-Natural-Preeminent-Alexandrite-Crystal-Mineral-Specimen/132672025596?hash=item1ee3de73fc:g:UgwAAOSwkIBbK0nj
Also a bit odd that the location is no more specific than 'China'. That doesn't exactly narrow it down!
Edit: the last two sold pieces went for $41 and $36 respectively.
23rd Jun 2018 01:12 UTCOwen Lewis
26th Aug 2018 15:30 UTCGaye Bishop
This seller refunded my purchase of another specimen known as Pruskite as I informed him when I found out it was laboratory created and not "accept natural, not perfect" is his motto. However I noticed he is still selling it and not stating it is laboratory created, and strangely a different colour than normal.
26th Aug 2018 15:49 UTCUwe Kolitsch Manager
27th Aug 2018 01:46 UTCGaye Bishop
27th Aug 2018 02:04 UTCMichael Hatskel
Try the hardness test: Quartz point shall easily scratch Apatite but not Chrysoberyl (Alexandrite).
27th Aug 2018 14:04 UTCNick Gilly
8th Feb 2019 09:50 UTCDmitry Stepanenko
Recently I have got a sample of this chinese material from my friend. Simple gemological tests (hardness, pleochroism, SG and RI) show that in fact this is grandidierite. As Gaye supposed, this material comes from Madagascar.
Best regards,
Dmitry.
8th Feb 2019 17:50 UTCNick Gilly
9th Feb 2019 16:56 UTCDmitry Stepanenko
As I see, there are dendrites of black material (probably manganese oxide) in white host rock?
As I already wrote, your stones are grandidierites. These dendrites seem to be typical for Madagascar grandidierites: I see them in my sample too.
Best regards,
Dmitry.
10th Feb 2019 08:45 UTCAlix Julien
I have already bought from this seller and I watch a few articles of time and it is true that there are from time to time identification mistakes:
Cuprite var. Chalcotrichite called just Cuprite or Arsenopyrite called just Pyrite for example ...
it gave me the opportunity to buy that (under the name pyrite and associate) and not expensive:
- Muscovite on Ferberite & Arsenopyrite - Yaogangxian Mine, Yaogangxian W-Sn ore field, Yizhang Co., Chenzhou pref., Hunan prov., China
Sometimes it is the seller that shoots itself in the foot :)
There are occasionally problems of identification on Ebay so always pay attention.
See you soon
Alix JULIEN
10th Feb 2019 11:22 UTCNick Gilly
I know exactly what you mean. I bought several nice specimens cheap on eBay last year because they were misidentified, e.g. ruby sold as spinel, spinel sold as zircon, phenakite sold as topaz, and Russian alexandrite sold as epidote! A couple of these were from mineral dealers too, which is all the more surprising.
Ruby is a good one because it sometimes forms pseudo-octahedral crystals which cause some sellers to assume it is the less valuable spinel.
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Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2024, except where stated. Most political location boundaries are © OpenStreetMap contributors. Mindat.org relies on the contributions of thousands of members and supporters. Founded in 2000 by Jolyon Ralph.
Privacy Policy - Terms & Conditions - Contact Us / DMCA issues - Report a bug/vulnerability Current server date and time: April 19, 2024 20:02:05