[Rockhounds] Sugilite fluorescence

[betdav97 at aol.com]

Axel,
  It is from South Africa, fluoresces only under short wave,
Unless I have it analized, I have no idea what the accompanying
minerals are. It is sugilite. No offense, but talking down to me
was the reason I unsubsribed from the UV forum. I don't mean
to cause hard feelings or cause a e-mail war, but there is plenty
of info on the orange fluorescence available on the net. I really
thought I had asked a decent question. Maybe I didn't, c'est le
guerre,
dave


-----Original Message-----
From: Axel Emmermann <axel.emmermann at pandora.be>
To: 'Rockhounds at drizzle.com: A mailing list for rock and gem 
collectors' <rockhounds at lists.drizzle.com>
Sent: Mon, 13 Oct 2008 2:02 pm
Subject: RE: [Rockhounds] Sugilite fluorescence



Hi Dave:



Pure speculation but here's my two cents:



When asking for advise on fluorescence you should always state:

1.        which UV lamp did you use: SW-or LW?

2.       Where is the specimen from?

3.       what are the accompanying minerals?



I don't think that sugilite fluoresces. I may appear to do so when mixed
with chalcedony. But then it is the chalcedony that fluoresces.

If the sugilite is purple in color, it could act as a colored filter 
which
stops the green fluorescing band of uranyl fluorescence and allows the
yellow and green to pass.  The green uranyl fluorescence, which is quite
common in chalcedony, would than appear orange. I think that is why
metakirchheimerite (Cobalt-uranyl arsenate) also fluoresces orange.



I have no idea about the red and the blue but that may be accompanying
minerals..



Cheers

Axel



> -----Oorspronkelijk bericht-----

> Van: rockhounds-bounces at lists.drizzle.com
[mailto:rockhounds-bounces at lists.drizzle.com]

> Namens betdav97 at aol.com

> Verzonden: maandag 13 oktober 2008 18:23

> Aan: rockhounds at lists.drizzle.com

> Onderwerp: [Rockhounds] Sugilite fluorescence

>

> Hi All,

>   Over the weekend at a show, I purchased a piece of

> sugilite, my first, way tooooo expensive, only because

> it fluoresced three colors, the normal orange, but also

> a very hot red and a deep blue. No, it is not lint. Any

> suggestions as to the activators in the specimen?

> Dave

> --

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