Database of luminescent Minerals


Chemical Formula:See chert

Familly: Rock

Status: NON APPR

Mineral for Display: No


UV Type Main color Intensity Observation Frequency
Long Waves (365nm):      Green
Short Waves (254 nm):      Green
Other colors LW:                                        
Yellowish White , Pale Yellow , Orangy yellow , Orange , Dark Orange /Tawn , Tawn , Greenish white , Yellowish ,
Other colors SW:                                        
Yellowish White , Pale Yellow , Orangy yellow , Orange , Dark Orange /Tawn , Tawn , Greenish white , Yellowish ,

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

UV Type Color Intensity Observation Frequency
Long Wave (365nm): No data
Mid Waves (320 nm): No data
Short Waves (254 nm): No data


A nodular chert, often grey/black, formed as nodules in Creataceous chalk.

Fluorescent colors are green due to uranyle ions presence or typically yellow-white to brown at all UV wavelengths. The outer part of the chert may have absorbed some organic matter from an exposure to it at some point in its history.

Main Activator(s) and spectrum:

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

Other activators:            Organic impurities ,

No spectrum for the moment

Best Locality for luminescence(*):

(*)Data are not exhaustive and are limited to the most important localities for fluorescence

Bibliographical Reference for luminescence:

Mineralogical Reference on internet:

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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.


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