Database of luminescent Minerals


hackmanite


Chemical Formula:See SODALITE

Familly: Silicates

Status:

Crystal System: Isometric

Mineral for Display: Yes


Luminescence:


UV Type Main color Intensity Observation Frequency
Long Waves (365nm):      Orange StrongAllways
Short Waves (254 nm):      Orangy yellow MediumVery often
Other colors LW:     
Orange Red ,
Other colors SW:                         
Bluish White , Yellowish White , Orangy yellow , Orange , Yellowish ,

Daylight Picture


hackmanite,
Photo and Copyright: James Hamblen
Site of the author
Used with permission of the author

Long Waves Picture (365nm)


hackmanite under UVLW,
Photo and Copyright: James Hamblen
Site of the author
Used with permission of the author

 

Galerie de photos:

            ...

     To the gallery (22 images in the gallery)


Phosphorescence (in the common meaning of the term) seen by naked eye:


UV Type Color Intensity Observation Frequency
Long Wave (365nm): Bluish White Medium
Short Waves (254 nm): Bluish White Very Strong
 

Ténébrescence: OUI




hackmanite, up after and down before exposition to SW (tenebrescence);
Koksha Valley, Badakhshan Province, Afghanistan; ;
Col. G.Barmarin; Photo: G. Barmarin

Thermoluminescence: Yes


Comments:


A sulfide rich sodalite and should not be regarded as a separate species.


Main Activator(s) and spectrum:


Most Common Activator: S2-

Peaks in the spectrum (nm):

S2-  : (566),(610), 625, 647, 664, (695), (723), (751nm)


Col. G. Barmarin; Spectre: G. Barmarin

   ...

  To the spectrum gallery (1 spectra in the gallery)


Comments on activators and spectra:


O. Ivan Lee investigated what he calls the "reversible photosensitivity" of hackmanite from Bancroft (Ontario) and his response to different UV sources as early as 1936. He presented the phenomenon for the 50th Anniversary Celebration Banquet of the New York Mineralogical Club, in November 18, 1936 at the American Museum of Natural History. It seems that it was the first observation and  the first public announcement and  publication (American Mineralogist vol 21) about photochromism (tenebrescence) in mineralogy.

Chemical analyses revealed that the mineral contains certain amount of sulfur as a substitute for chlorine in the crystal structure.The FTIR spectra of hackmanite showed that the samples contain water. The stretching vibration peak of water of crystallization (H2O) occurs at 3 438 cm-1 and the bending peak is at 1 623 cm-1 . Its tenebrescence is caused by ″hole colour centres″ which are contributed to the presence of sulfur (S22-)) and to some negatively charged chlorine atoms being missing in the crystal structure of hackmanite. (source: http://www.geology.com.cn/Geology-Journals/article-35765.html)


Crystals of Hackmanite of Koksha Valley in Afghanistan are usually found in a matrix constituted by non fluorescing Winchite and/or marble.


Best Locality for luminescence(*):


(*)Data are not exhaustive and are limited to the most important localities for fluorescence


Bibliographical Reference for luminescence:



Luminescence Reference on internet:



Mineralogical Reference on internet:


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

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

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