Luminescence, fluorescence and phosphorescence of minerals

HOLDENITE

DOUBTFULL FLUORESCENCE but cited by some authors

Chemical Formula: (Mn⁺²,Mg)₆Zn₃(AsO₄)₂(SiO₄)(OH)₈

Familly: Silicates

Status: IMA-GP

Crystal System: Orthorhombic

Mineral for Display: No

Luminescence:

UV Type	Main color	Intensity	Observation Frequency

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

No Data

Main Activator(s) and spectrum:

No data

Comments on activators and spectra:

It was added to the list of fluorecent minerals of Franklin in 2014 after a study of all the sample of the Franklin Museum with blue light by Charles Mazel and Earl R Verbeeck. (see bibliography)

Holdenite is best excited under true blue (440-450nm) light and show a dull olive-green luminescence. In LW there is no response and it was not considered as fluorescent before this study. Only a single specimen was tested and further study must be conducted. It could be that the yellow-green luminescence of willemite under the Holdenite excited by the powerfull blue led through this mineral is filtered by the pinkiish color of holdenite letting only a dim orange-yellow color to pass through.

Best Locality for luminescence(*):

Franklin Mine, Franklin, Franklin Mining District, Sussex Co., New Jersey, USA;

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

Bibliographical Reference for luminescence:

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Database of luminescent Minerals