Database of luminescent Minerals


Chemical Formula: CaMoO4

Familly: Tungstates, Molybdates

Status: IMA-GP

Crystal System: Tetragonal

Mineral for Display: Yes


UV Type Main color Intensity Observation Frequency
Long Waves (365nm):      Yellowish White WeakVery rarely
Short Waves (254 nm):      Yellowish White Very StrongAlways
Other colors SW:                              
White , Bluish White , Pale Yellow , Greenish , Bluish Green , Greenish white ,

Daylight Picture


Col. G.Barmarin; Photo: G. Barmarin

Short Waves Pictures (254nm)

OC (254 nm)
Col. G.Barmarin; Photo: G. Barmarin


Galerie de photos:


     To the gallery (10 images in the gallery)

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

No Data


The tungstates of calcium, strontium, magnesium and zinc, and the molybdates of calcium are known to show luminescence upon excitation by cathode rays or short-wave ultra-violet radiation. It is commonly assumed that this luminescence is characteristic of the tungstate and molybdate groups. The reason why other tungstates and molybdates are found to be non-luminescent is probably the temperature-quenching (see Nature article by F.  A. Kröger in 1947 in the bibliography).

Main Activator(s) and spectrum:

Most Common Activator: MoO42-

Other activators:            (UO2)2+ (Uranyl ion) as impurities , Er3+ , Pr3+ , Nd3+ ,

Peaks in the spectrum (nm):

MoO42- : Broad band peaking at 530 - 550 nm (Gorobets)

(Lifetime: 30 μs)

UO22+ : 650nm (uranyl complexes substituting to molybdenum (Panczer et al.))

Nd3+ : 810, 870nm

Col. G.Barmarin; Photo: G. Barmarin


  To the spectrum gallery (1 spectra in the gallery)

Comments on activators and spectra:

The natural photoluminescence emission of ordered CaMoO4 is attributed to an intrinsic slight distortion of the [MoO4] tetrahedral goup.

The decay time is 200 μs .

Under 532 nm cw excitation the luminescence of Pr3+, Er3+, Nd3+ as well as [UO2]2+ were revealed in powellite found associated with pitchblende and molybdenite in South Kazakhstan (Bota-Burum Mo-U deposits). (Gaft)

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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