Chemical Formula: CaMn+2Si2O6
Familly: Silicates
Status: IMA-A (GP)
Crystal System: Monoclinic
Mineral for Display: No
UV Type | Main color | Intensity | Observation Frequency |
---|---|---|---|
Long Waves (365nm): | Dark Orange /Tawn | Very weak | Mid waves (320 nm): | Not fluorescent | Short Waves (254 nm): | Not fluorescent |
Other colors LW: | Yellow , |
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) Johannsenite is best excited under true blue (440-450nm) light and show a yellow luminescence. in LW the response is so weak that it was not considered as fluorescent before this study.
(*)Data are not exhaustive and are limited to the most important localities for fluorescence
http://www.mindat.org/show.php?name=Johannsenite
http://webmineral.com/data/Johannsenite.shtml
Search for images on 'Google Image'
Search for documents in English on Google
Search for documents in any languages on Google