Database of luminescent minerals 

HELVITE

Chemical formula: Mn₄⁺²Be₃(SiO₄)₃S

Family: Silicates

Status: IMA-GP

Crystal system : Isometric

Display mineral: NON

Luminescence:

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

No data

Comments:

Mt St Hilaire helvite can be reliably distinguished from genthelvite via its UV response (deep red vs green - Horvath et al Min Rec 1990 etc.). 

Activator(s) and spectrum:

Activator(s): Mn²⁺ ,

Peaks in the spectrum (nm):

Mn²⁺ intrinsic : Broad band peaking at 620 - 640 nm

No spectrum yet

Best localities for fluorescence (*):

• Sandoya, Porsgrund, Langesundfjord, Larvik Plutonic Complex, Norway;
• Poudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada (red SW);
• Saga 1 Quarry, Sagåsen, Mørje, Porsgrunn, Langesundfjord, Larvik Plutonic Complex, Telemark, Norway (SW & LW Red);
• Navegadora claim, Penha do Norte, Conselheiro Pena, Doce valley, Minas Gerais, Brazil (weak fluo SW+LW);

(*)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 ,
• Fluorescence: Gems and Minerals Under Ultraviolet Light, Manuel Robbins, 1994, Geoscience Press, ISBN 0-945005-13-X ,
• The World of Fluorescent Minerals, Stuart Schneider, Schiffer Publishing, 2006, ISBN 0-7643-2544-2 ,
• Luminescence Spectroscopy of Minerals and Materials, M. Gaft, R. Reisfeld, G. Panczer, Springer Editor, ISBN: 10 3-540-21918-8 ,
• Mt St Hilaire Website: http://www.saint-hilaire.ca ,

Reference for luminescence on the Internet:

Mineralogical reference on the Internet:

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

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

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