Database of luminescent Minerals


Chemical Formula: KCa4Si8O20(F,OH) 8H2O

Familly: Silicates

Status: IMA-A

Crystal System: Tetragonal

Mineral for Display: No

Associated names (luminescent varieties, discredited names, synonymes etc.):  apophyllite


UV Type Main color Intensity Observation Frequency
Long Waves (365nm):      Yellowish White
Mid waves (320 nm):      Blue
Short Waves (254 nm):      Greenish
Other colors LW:               
Yellow , Greenish , Blue ,
Other colors MW:     
Greenish Yellow ,
Other colors SW:                         
Bluish White , Yellowish White , Greenish Yellow , Green , Blue ,

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

No Data

Main Activator(s) and spectrum:

Most Common Activator: (UO2)2+ (Uranyl ion) as impurities

Other activators:            Ce3+ , Mn2+ ,

Peaks in the spectrum (nm):

(UO2)2+ : band around 525nm with peaks at 504, 522, 544nm

Mn2+ replacing Ca2+ : band peaking at 600-625nm

Ce3+ replacing Ca2+ : 343, 355, 365, 372nm

[VO4]n- or [TiO4]n- replacing [SiO4] : 500nm

Spectrum: Michael Gaft, Petah Tikva, Israel. Plot: Institute of Mineralogy, University of Vienna, Austria, with permission of the authors.


  To the spectrum gallery (3 spectra in the gallery)

Comments on activators and spectra:

A specimen from the Nadym River area fluoresces red due to manganese activator. From Mont Saint-Hilaire, crystals have been found that fluoresce intense blue like that of Fluorite under SW, MW, and LW (Jacques Poulin). Also Green luminescence due to U impurities in this locality (pics around 525 nm).

Two different Mn2+ luminescence centers have been found in steady-state spectra of apophyllite: in Ca position with orange luminescence peaking at 600 - 620 nm and in K position with green emission peaking at 500 nm (Tarashchan 1978 cited by 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:

Search on Internet:

  Search for images on 'Google Image'

  Search for documents in English on Google

  Search for documents in any languages on Google

  Search on Wikipédia


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.


Quick search by fluorescent mineral name: