COMPREIGNACITE

 


DOUBTFUL FLUORESCENCE but sometimes cited in luminescence literature

Chemical formula: K2(UO2)6O4(OH)6 7H2O

Family: Oxides and hydroxides

Status: IMA-A

Display mineral: NON

 

Luminescence:

Longwave UV (365nm) colors:

    


Green ,

Intensity LW:Weak

Shortwave UV (254nm) colors:

    


Green ,

Intensity SW:Weak

Daylight picture


CEJKAITE ,
Mina Eureka termino de Castell-estaó,
municipio de La Torre de Cabdella,
Lérida province, Spain
Photo and Copyright: Joan Abella i Creus, Spain
Used with permission of the author

Shortwave (254nm) picture


COMPREIGNACITE , UVSW
Mina Eureka termino de Castell-estaó,
municipio de La Torre de Cabdella,
Lérida province, Spain
Photo and Copyright: Joan Abella i Creus, Spain
Used with permission of the author

 

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

No data

Comments:

usually cited as non-fluorescent in the litterature despite pictures and samples in collection; identification to be verified;

Activator(s) and spectrum:

Activator(s): (UO2)2+ (ion Uranyle) intrinsèque ,

Peaks in the spectrum (nm):

(504nm), 525nm, 546nm, 585nm, (593nm) / 500.7, 516.1, 532.4, 554.3, and 579.6 nm (Thuro Arnold and Nils Baumann)/


Col. G. Barmarin; Spectre: G. Barmarin

Comments on spectrum and activators:

fluorescence lifetimes of 202 and 914 ns (bi-exponential)

Best localities for fluorescence (*):

  • “Mina Eureka” término de Castell-estaó, municipio de La Torre de Cabdella, provincia de Lérida, Spain;

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

    Bibliographic reference for luminescence:

    Reference for luminescence on the Internet:

  • Joan Abella i Creus, Spain;
  • Boltwoodite [K(UO2)(SiO3OH)(H2O)1.5] and compreignacite K2[(UO2)3O2(OH)3]2·7H2O characterized by laser fluorescence spectroscopy, Thuro Arnold and Nils Baumann, Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, Volume 71, Issue 5, January 2009, Pages 1964-1968.

    • Mineralogical reference on the Internet:

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

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

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