Database of luminescent Minerals


Chemical Formula: XCa2Mg5Si8O22(OH)2

Familly: Silicates


Crystal System: Monoclinic

Mineral for Display: No

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


UV Type Main color Intensity Observation Frequency
Long Waves (365nm):      Orange
Short Waves (254 nm):      Orange Red
Other colors LW:               
Yellowish White , Pale Yellow , Yellowish ,
Other colors SW:               
Bluish White , Yellow , Blue ,

Daylight Picture

Photo and Copyright: James Hamblen
Site of the author
Used with permission of the author

Short Waves Pictures (254nm)

Photo and Copyright: James Hamblen
Site of the author
Used with permission of the author


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

UV Type Color Intensity Observation Frequency
Short Waves (254 nm): Red

Triboluminescence: Yes

Thermoluminescence: Yes


Gouverneur Talc Co, Balmat and Talcville: tremolite (fl. orange SW) associated with tirodite ( SW) and talc (fl. yellow SW).

Main Activator(s) and spectrum:

Most Common Activator: Mn2+

Other activators:            Cr3+ , Fe3+ ,

Peaks in the spectrum (nm):

Mn2+I repl. Ca2+ : 580nm

Fe3+ repl. Si4+ : 720-740nm

Cr3+ repl. Mg2+? : 690-698nm

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:

Luminescence Reference on internet:

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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