Database of luminescent Minerals


Chemical Formula: CaC2O4 H2O

Familly: Organic

Status: IMA-GP

Crystal System: Monoclinic

Mineral for Display: No


UV Type Main color Intensity Observation Frequency
Long Waves (365nm):      Bluish White Strong
Short Waves (254 nm):      Bluish White Medium

Daylight Picture

Whewellite, Dolny, Bilina, Tchéquie.

Photo and Copyright: Gérard Barmarin.

Long Waves Picture (365nm)

Whewellite, UVLW, Dolny, Bilina, Tchéquie.

Photo and Copyright: Gérard Barmarin.

Short Waves Pictures (254nm)

Whewellite, UVSW, Dolny, Bilina, Tchéquie.

Photo and Copyright: Gérard Barmarin.


Galerie de photos:


     To the gallery (5 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): Greenish white Strong
Short Waves (254 nm): Greenish white Weak


Occurs as calculi or as a sediment in the human urinary tract. Also described as a product of fungal activity  in Limecrusts, some calcretes, leaf litter and soils in forests; also formed by lichen on various rocks (basalts, serpentinites, Cu-bearing rocks, gabbroes, dolerites, andesites); 

Cleaning any specimen containing Ca-bearing soluble species with oxalic acid will lead to crystallisation of whewellite or weddellite. (see

Main Activator(s) and spectrum:

Most Common Activator: Organic impurities

Peaks in the spectrum (nm):

410nm, 480nm, 512nm 546nm 604nm 708nm


Whewellite, Dolny, Tchequie.
Excitation: laser 405nm. Col. G. Barmarin; Spectre: G. Barmarin

Comments on activators and spectra:

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

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:

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