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 Post subject: Color change Apatite?
PostPosted: Tue Aug 22, 2017 9:07 pm 
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I was recently given 2 stones about the size of your thumbnail. They thought they might be color change Apatite. In natural light they are a yellowish green. Not sure if I can see a change in color at all. Maybe a bit more gold than green but I'm not sure. What should I expect to see from a color change Apatite? Under what light.

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 Post subject: Re: Color change Apatite?
PostPosted: Tue Aug 22, 2017 11:37 pm 
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I'm skeptical.
If you want to send them to me, I will ID them for you.
Cost? Return shipping.


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 Post subject: Re: Color change Apatite?
PostPosted: Wed Aug 23, 2017 11:49 am 
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Well that was my thought too, skepticism is my strong suite. I'm starting my last class for GG this month. Colored stone ID and will probably take the lab in the spring. If I haven't figured it out by then I probably need to choose a different profession.
By the way your practice stone set is great fun. Even got my oldest son to look at a few. I claim poor eyesight and he pops in to verify readings. He knows what I'm up to but plays the game anyway. Getting better with my instruments and understanding a bit more each time.
Thanks Barbra.

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 Post subject: Re: Color change Apatite?
PostPosted: Wed Aug 23, 2017 1:26 pm 
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My pleasure. :D


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 Post subject: Re: Color change Apatite?
PostPosted: Wed Aug 23, 2017 5:36 pm 
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I think that almost anything in this color range (slightly greenish yellow) will shift at least a little bit, between purer gold in incandescent light and a greener gold in LED light. I would bet that you could see similar results from most of the classic Durango apatites. IIRC Arya has a synthetic apatite with a significant color change though.

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 Post subject: Re: Color change Apatite?
PostPosted: Wed Aug 23, 2017 8:59 pm 
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Thanks Stephen, it may be that it's just not that strong of a change. I will look again with better lighting. Nice rough all the same, clean stones.

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 Post subject: Re: Color change Apatite?
PostPosted: Tue Mar 20, 2018 8:00 am 
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I have some apatites from Kazakhstan, it change color from light yellow to orangish pink.
This color change apatite have been recorded in Gems & Gemology, 2002 Winter.


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 Post subject: Re: Color change Apatite?
PostPosted: Thu Mar 22, 2018 3:14 pm 
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Hi manbeige!! :D

Nice to have you here!!!

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 Post subject: Re: Color change Apatite?
PostPosted: Mon Mar 26, 2018 12:19 am 
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Marlow wrote:
Hi manbeige!! :D

Nice to have you here!!!


Hi, Marlow, nice to meet you,too.
Although I have registered this forum for two years, this is the first time I have chatted in the Forum. :D


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 Post subject: Re: Color change Apatite?
PostPosted: Mon Mar 26, 2018 2:07 pm 
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Some years ago we discussed SYNTHETIC color change apatite:
G&G, Winter 2010
SYNTHETIC GEM MATERIALS IN THE 2000s:
A DECADE IN REVIEW
describes:
Quote:
A synthetic apatite with a color change
from purple pink in incandescent light to violetish
blue in fluorescent light was reported by McClure
(2001). While most of the gemological properties
were consistent with natural apatite, suspicion arose
from an unusual spectrum (seen with a desk-model
spectroscope) that was different from natural material.
EDXRF analysis showed that the synthetic apatite contained a significant amount of neodymium and a small amount of strontium.
Magnification revealed chevron-type growth and elongated gas bubbles,
features that strongly supported a synthetic origin.
While synthetic apatite is an
oddity in the gem world, it has previously been
reported for laser applications (Koivula et al., 1992).


IMO, the additives neodymium and strontium would technically classify it as an artificial product


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 Post subject: Re: Color change Apatite?
PostPosted: Mon Mar 26, 2018 5:37 pm 
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manbeige wrote:
I have some apatites from Kazakhstan, it change color from light yellow to orangish pink.
This color change apatite have been recorded in Gems & Gemology, 2002 Winter.


https://www.gia.edu/doc/WN02.pdf

page 350


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 Post subject: Re: Color change Apatite?
PostPosted: Mon Mar 26, 2018 7:41 pm 
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Yes, the color described does sound more like the material described in G&G Winter 2002, than the synthetic described in 2010.

Pictures?


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 Post subject: Re: Color change Apatite?
PostPosted: Wed Mar 28, 2018 2:14 am 
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I just got a 6.4ct color change apatite from cutter. It change color from light yellow near colorless to light pink. And the color changing of rough is stronger than the faceted gemstones. The photos I taken is not so exact to show its color.


Attachments:
File comment: 6.4ct faceted apatite in incandescent light
IMG_20180326_031950.jpg
IMG_20180326_031950.jpg [ 154.06 KiB | Viewed 2054 times ]
File comment: 6.4ct faceted apatite in daylight
IMG_20180326_031930.jpg
IMG_20180326_031930.jpg [ 140.01 KiB | Viewed 2054 times ]
File comment: apatite with muscovite and smoky quartz in incandescent light
IMG_20180320_161449.jpg
IMG_20180320_161449.jpg [ 331.47 KiB | Viewed 2054 times ]
File comment: apatite with muscovite and smoky quartz in daylight
QQ图片20180327132457.jpg
QQ图片20180327132457.jpg [ 302.75 KiB | Viewed 2054 times ]
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