Database of luminescent minerals 

amethyst   (French name: amethyste )

Mineral NOT FLUORESCENT but sometimes cited in luminescence literature

Chemical formula: See QUARTZ

Family: Oxides and hydroxides

Status: NR

Crystal system : Rhomboedric

Display mineral: NON

Luminescence:

Daylight picture

Amethyste,
Kedon, Magadanskaya Oblast, Far-Eastern Region, Russia;
Col. G.Barmarin; Photo: G. Barmarin

Shortwave (254nm) picture

Amethyste, UVSW
Kedon, Magadanskaya Oblast, Far-Eastern Region, Russia;
Col. G.Barmarin; Photo: G. Barmarin

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Phosphorescence (in the common sense of the term) observable with the naked eye:

No phosphorescence visible to the naked eye under any type of UV

Comments:

You can sometime find amethyst crystal covered by an invisible coating of hyalite fluorescing in green under SW. It looks like it is the amethyst crystal itself which is luminescent but it is the hyalite.

Activator(s) and spectrum:

Activator(s): (UO₂)²⁺ (ion Uranyle) en impureté,

Peaks in the spectrum (nm):

UO₂²⁺ (hyalite coating) : Broad band (120nm) peaking at 514 and 550nm, (493), (594)

No spectrum yet

Comments on spectrum and activators:

Broad band with max at 514nm and 550nm and shoulder at 493 and 594nm; the max are in correlation with the peaks of hyalite spectrum taken from other part of the rock.

Best localities for fluorescence (*):

• Kedon, Magadanskaya Oblast, Far-Eastern Region, Russia;

(*)The data are not exhaustive and are limited to a few remarkable localities for fluorescence

Bibliographic reference for luminescence:

• The Henkel Glossary of Fluorescent Minerals, Dr. Gerhard Henkel, Published by the FMS, 1989 ,

Mineralogical reference on the Internet:

  http://www.mindat.org/show.php?name=Amethyst

  http://webmineral.com/data/Amethyst.shtml

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