WEDDELLITE

 


Chemical formula: Ca (C2 O4) 2H2 O

Family: Organic

Status: IMA-GP

Crystal system : Tetragonal

Display mineral: NON

 

Luminescence:

Longwave UV (365nm) colors:

    


Yellowish White ,

 

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

Type d'UV

Couleur

Intensité

Fréquence d'observation

UV longs (365nm):

No data

UV moyens (320 nm):

No data

UV courts (254 nm):

No data
 

Comments:

Authigenic in bottom sediments and peat; in calcareous lacustrine sediments; also formed by reaction of calcite with oxalic acid derived from lichens; also from solutions derived from bat guano. Known as component of human urinary stones. May also be produced by fungi.

Weddellite is often polluted by organic compound probably causing the fluorescence and phosphorescence (Humic acid? polycyclic aromatic hydrocarbons?).

It dehydrates readily upon exposure to air, transforming into the monohydrate form whewellite.

Cleaning any specimen containing Ca-bearing soluble species with oxalic acid will lead to crystallisation of whewellite or weddellite. (see https://www.mindat.org/min-4254.html)

Activator(s) and spectrum:

Activator(s): ST (Singlet-triplet)-Matière organique en impureté,

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=Weddellite

  http://webmineral.com/data/Weddellite.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.