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PhotosFluorapatite - Siglo Veinte Mine, Llallagua, Rafael Bustillo Province, Potosí Department, Bolivia

9th Dec 2017 19:02 GMTTony Peterson Expert

Copyright © John Rakovan. All rights reserved.
This image is copyrighted. Unauthorized reproduction prohibited.
The purple color from the top of the crystal looks to be reflection of visible blue-violet light from the UV source. There may well be sector zoning in fluorescence, but I'm not sure it can be observed in this image.

9th Dec 2017 19:05 GMTUwe Kolitsch Manager

This would not explain the thin purple layer at the crystal's bottom (unless the crystal sits on a reflecting glass plate?).

9th Dec 2017 19:24 GMTReiner Mielke Expert

Probably some sort of coating that has preferentially attached itself to the pedions.

9th Dec 2017 21:27 GMTErik Vercammen Expert

The same pic is on page 16 of extra Lapis 17 "Apatite - the great pretender"; the caption there says "sector-zoned fluorescent fluorapatite..... Blue and orange luminescence is activated by different rare-earth elements between the prism and pinacoid faces and sectors"

10th Dec 2017 00:43 GMTAlfredo Petrov Manager

Well, the photo is by Dr John Rakovan, who has access to lots of high-tech toys and who has published an enormous body of research on apatites in general and Siglo XX in particular, so I wouldn't try to second-guess anything he says about this specimen. Perhaps he will respond himself to this topic.

10th Dec 2017 01:39 GMTTony Peterson Expert

OK! That is a wild and crazy color.
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