Lijst van fluorescerende mineralen

POWELLITE

Scheikundige formule: CaMoO₄

Familie: Tungstaten, Molybdaten

Status: IMA-GP

Kristal Systeem: Tetragonaal

Mineraal om tentoon te stellen: Ja

Fluorescentie:

Daglicht foto

POWELLITE, India.

Col. G.Barmarin; Photo: G. Barmarin

Korte golf foto (254nm)

POWELLITE, India.
OC (254 nm)
Col. G.Barmarin; Photo: G. Barmarin

Foto galerij:

     Naar de volledige galerij (10 beelden in totaal)

Fosforescentie (in de algemene betekenis) zien met het blote oog:

Commentaar:

The tungstates of calcium, strontium, magnesium and zinc, and the molybdates of calcium are known to show luminescence upon excitation by cathode rays or short-wave ultra-violet radiation. It is commonly assumed that this luminescence is characteristic of the tungstate and molybdate groups. The reason why other tungstates and molybdates are found to be non-luminescent is probably the temperature-quenching (see Nature article by F.  A. Kröger in 1947 in the bibliography).

Activator en spectrum:

Voornaamste Activator: MoO₄^2-

Andere activatoren: (UO₂)²⁺ (Uranyl ion) (onzuiverheden) , Er³⁺ , Pr³⁺ , Nd³⁺ ,

Pieks in het spectrum (nm):

MoO₄^2- : Broad band peaking at 530 - 550 nm (Gorobets)

(Lifetime: 30 μs)

UO₂²⁺ : 650nm (uranyl complexes substituting to molybdenum (Panczer et al.))

Nd³⁺ : 810, 870nm

  Vers la galerie de spectres (1 spectres au total)

Commentaar over activators en spectra:

The natural photoluminescence emission of ordered CaMoO₄ is attributed to an intrinsic slight distortion of the [MoO₄] tetrahedral goup.

The decay time is 200 μs .

Under 532 nm cw excitation the luminescence of Pr³⁺, Er³⁺, Nd³⁺ as well as [UO₂]²⁺ were revealed in powellite found associated with pitchblende and molybdenite in South Kazakhstan (Bota-Burum Mo-U deposits). (Gaft)

Beste vindplaats voor fluorescentie(*):

• Pandulena quarry, Nasik district, India;
• Mahodari, Nasik, Pune (Poona), Maharashtra, India;
• Nangaon, Aurangabad District, Maharashtra, India;
• Jalgaon, Maharashtra, India;
• Ahmednagar District, Maharashtra, India;
• Shakur Quarry, Nashik District, Maharashtra, India (with celadonite inclusions, fluo green);
• Ultevis, Jokkmokk, Norrbotten County, Sweden;
• Jardinera No. 1 Mine, Inca de Oro mining district, Chañaral Province, Atacama, Chile;

(*)Gegevens zijn niet exhaustieve, ze zijn beperkt tot de meest belangrijke plaatsen voor fluorescentie

Referentie voor fluorescentie:

• 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 ,
• Luminescent Spectra of Minerals, Boris S. Gorobets and Alexandre A. Rogojine, Moscow, 2002 ,

Referentie voor luminenscentie op het internet:

• The Langesundsfjord: history, geology, pegmatites, minerals, Alf Olav Larsen, Bode Verlag Gmbh, 2010 ISBN 978-3-925094-97-2
• F. A. KRÖGER , Fluorescence of Tungstates and Molybdates,Nature,159, pages674–675(1947)
• MONT-SAINT-HILAIRE, History, Geology, Mineralogy, Laszlo HORVATH, The Canadian Mineralogist, Special Publication 14, 2019

 

Images:

 

• Ultevis, Sweden: https://www.mindat.org/photo-167365.html
• Jardinera No. 1 Mine, Atacama, Chile: https://www.mindat.org/photo-143047.html
• Nashik, India (with celadonite inclusions, fluo green): https://www.mindat.org/photo-201265.html
• Nashik, India: https://www.mindat.org/photo-625344.html
• Franklin, NJ, USA: https://www.mindat.org/photo-901746.html

Mineralogische Referentie op het internet:

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

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

Onderzoek op Internet:

  Beelden op 'Google Image'

  Dokumenten in het Nederlands op Google

  Dokumenten in alle talen op Google

  Onderzoek op Wikipédia