achroite   (French name: achroïte )


Chemical formula: See ELBAITE

Family: Silicates

Status: NR

Crystal system : Rhomboedric

Display mineral: NON

 

Luminescence:

Longwave UV (365nm) colors:

    


Blue ,

Midwave UV (320nm) colors:

    


Yellow ,

 

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

No data

Comments:

Some very small crystals (a few mm) of achroïte from Elba Island are fluorescing the normal blue color under UV at 380nm and an unusual bright yellow fluorescence under UV at 306nm.
Activator is unknown, but the achroïte contain Mn and a very high amount of Mg (15-20%) but many non fluorescent tourmaline contain as much Mg.
Some very small crystals of achroïte included in quartz are practically only detectable by their strong yellow fluorescence.
Other colored tourmaline (pink, yellow and green) from Elba show sometimes a very weak yellow fluorescence.

Activator(s) and spectrum:

No data

Peaks in the spectrum (nm):

Excitation 380nm: 439nm;

Excitation 306nm: 350nm and 568nm;

No spectrum yet

Best localities for fluorescence (*):

(*)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:

  • Der Aufschluss, Vol 48, #1, 1997, by A. Zappel, P. Bouten and H. Schumann
  • UV-Waves May-june 1997, Fluorescence of Achroites from Elba, Italy by K.H. Russ 

Mineralogical reference on the Internet:

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

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

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Note: While all due attention has been paid to the implementation of the database, it may contain errors and/or accidental omissions. By nature, the database will always be incomplete because science always evolves according to new analysis.
A request providing no result means only that no such reference exists in the database, but it does not mean that what you are looking for does not exist, just not to our knowledge. If you think you have found an error or omission, please let us know via the contact page being sure to cite the source of information.