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Journal Article

Blue Dravite ('Indicolite') from the Elahera Gem Field, Sri Lanka

Authors

Nasdala,  Lutz
External Organizations;
GFZ SIMS Publications, Deutsches GeoForschungsZentrum;

Wildner,  Manfred
External Organizations;
GFZ SIMS Publications, Deutsches GeoForschungsZentrum;

Giester,  Gerald
External Organizations;
GFZ SIMS Publications, Deutsches GeoForschungsZentrum;

Chanmuang N.,  Chutimun
External Organizations;
GFZ SIMS Publications, Deutsches GeoForschungsZentrum;

/persons/resource/mariro

Scicchitano,  Maria Rosa
3.1 Inorganic and Isotope Geochemistry, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;
GFZ SIMS Publications, Deutsches GeoForschungsZentrum;

Hauzenberger,  Christoph
External Organizations;
GFZ SIMS Publications, Deutsches GeoForschungsZentrum;

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Citation

Nasdala, L., Wildner, M., Giester, G., Chanmuang N., C., Scicchitano, M. R., Hauzenberger, C. (2021): Blue Dravite ('Indicolite') from the Elahera Gem Field, Sri Lanka. - Journal of Gemmology, 37, 6, 618-630.
https://doi.org/10.15506/JoG.2021.37.6.618


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5007056
Abstract
A strongly dichroic (vivid blue to near-colourless) tourmaline specimen from the Elahera gem field, central Sri Lanka, was identified as dravite. The sample shows strong Fe2+-related optical absorption (E⊥c) in the red range and comparably weak red emission due to Cr3+. The discovery of virtually Cu-free blue dravite (with a Li content of only about 3 ppm) shows that blue colour in gem tourmaline is not restricted to Cu- and/or Fe-bearing elbaite and other lithium tourma-lines. Also, this study reconfirms the usefulness of Raman spectroscopy for non-destructive mineral identification. The sensitivity of Raman shifts of O–H stretching bands to their nearest-neighbour cations allowed us to exclude the presence of significant amounts of Li ions, even before obtaining results of light-element analysis.