MAGNESITE
Chemical Formula: MgCO3
Familly: Carbonates
Status: IMA-GP
Crystal System: Rhomboedric
Mineral for Display: No
Associated names (luminescent varieties, discredited names, synonymes etc.):
giobertite,
Luminescence:
UV Type |
Main color |
Intensity |
Observation Frequency |
|
| | | |
Long Waves (365nm): | Yellowish White | | | Short Waves (254 nm): | Bluish White | | | | | | |
Other colors LW: | Bluish White , |
Other colors MW: | Blue , Bluish , sky-blue , |
Other colors SW: | sky-blue , |
Phosphorescence (in the common meaning of the term) seen by naked eye:
UV Type |
Color |
Intensity |
Observation Frequency |
Long Wave (365nm): | Yellowish White | | |
Short Waves (254 nm): | Bluish White | | |
Triboluminescence: Yes
Main Activator(s) and spectrum:
Most Common Activator: O*
Other activators: Organic impurities , Mn2+ ,
Peaks in the spectrum (nm):
O*around [CO3]* : 430nm
ST: 520nm
Mn2+ repl. Mg2+: 654 - 660nm - 673nm (FWHM: 100nm)
No spectrum for the moment
Comments on activators and spectra:
Mn2+ activated luminescence in magnesite is characterized by single Gaussian peak at 15300 cm−1 (654 nm).
The CL intensity is nonlinearly related to the Mn2+ concentration.
Best Locality for luminescence(*):
- Sonoma County, California, USA;
- Kern, California, USA;
- Bare Hills, Baltimore Co., Maryland, USA (pale white LW);
- Near Cedar Hill Quarry, Lancaster County, Pennsylvania, USA (deweylite + magnesite);
- Haines & Kibblehouse Penn-Maryland Materials Quarry, Fulton Township, State Line Chromite District, Lancaster Co., Pennsylvania, USA (strong white LW+SW);
- Muntodi, Greece (Phosphorescence blue-white SW);
- Baumgarten, Germany (green-white fluorescence and phosphorescence);
- Pomba pit, Serra das Éguas, Brumado, Bahia, Brazil (weak luminescence SW+LW);
- Wiry, Gogołów-Jordanów Massif, Lower Silesia, Poland (blue LW+SW);
(*)Data are not exhaustive and are limited to the most important localities for fluorescence
Bibliographical Reference for luminescence:
- The Henkel Glossary of Fluorescent Minerals, Dr. Gerhard Henkel, Published by the FMS, 1989 ,
- Luminescent Spectra of Minerals, Boris S. Gorobets and Alexandre A. Rogojine, Moscow, 2002 ,
- Handbook of Fluorescent Gems and Minerals, a practical guide for the gem and mineral collector, Jack de Ment, 1949 ,
Luminescence Reference on internet:
Mn2+-activated luminescence in dolomite, calcite and magnesite: quantitative determination of manganese and site distribution by EPR and CL spectroscopy, Ahmad El Ali, Vincent Barbin, Georges Calas, Bernard Cervelle, Karl Ramseyer, Jacqueline Bouroulec, Chemical Geology, Volume 104, Issues 1–4, 10 February 1993, Pages 189-202
Images:
Mineralogical Reference on internet:
http://www.mindat.org/show.php?name=Magnesite
http://webmineral.com/data/Magnesite.shtml
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