pearl   (French name: perle )


Chemical formula: See ARAGONITE

Family: Organic

Status: NR

Display mineral: NON

 

Luminescence:

Longwave UV (365nm) colors:

                   


Yellowish White , Bluish White , Violet Pink , Salmon pink ,

Midwave UV (320nm) colors:

    


Bluish White ,

Shortwave UV (254nm) colors:

    


Bluish White ,

 

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

No data

Comments:

The mother-of-pearl is formed from aragonite mixed with conchylin.

 

Some non-pearly brown, gray or black pearls like the famous 'Hope' pearl have an orange-red fluorescence (see bibliography: The Journal ot Gemmology, vol. 26-1, 1998).

 

The peculiarity of Pteria Sterna pearls from the Sea of ​​Cortez and of the mother-of-pearl of their shell is the pink-red fluorescence due to porphyrin under ultraviolet radiation at 365 nm (UVL). They are inert under short wavelength ultraviolet radiation (254 nm, UVC). (see bibliography: paper of 'Laboratoire français de gemmologie')

Activator(s) and spectrum:

No data

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:

Mineralogical reference on the Internet:

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

  http://webmineral.com/data/Pearl.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.
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