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Elbaite : Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)

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Copyright © Van King
 
 
 
minID: QWA-X6J

Elbaite : Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)

Copyright © Van King  - This image is copyrighted. Unauthorized reproduction prohibited.

Elbaite variety watermelon with large rubellite core and thin green elbaite rind in cleavelandite. Comparison of nearly the same orientation of specimen in white light (left) and short wave ultraviolet light (right). The rubellite fluoresces a medium blue while the green fluoresces with lower intensity as its small iron content quenches part of the fluorescence. Dunton Quarry elbaite does not particularly fluoresce in long wave UV. Newry elbaite is well-known to fluoresce and was used by Beesley (1975) as a simple test to distinguish Newry elbaite from most worldwide elbaite, although fluorescence was noted by him in a few localities in Brazil and Africa. Beesley (1975) did not mention a single Dunton Quarry gem elbaite that did not fluoresce. Although worldwide elbaite does not usually fluoresce, several Maine localities have this characteristic, but few localities have such a high proportion of their elbaite that is fluorescenet. Elbaite from Newry with lepidolite replacement may have a creamy yellow fluorescence in both short and long wave UV due to the lepidolite's fluorescence. Specimen is 10 x 8 cm.

This photo has been shown 1062 times
Photo added:7th Oct 2008
Dimensions:1098x800px (0.88 megapixels)
Date/Time of Photo:7th Oct 2008 00:00:26
Camera:NIKON COOLPIX P5100
Software:Adobe Photoshop CS2 Windows
Exposure time:1/204s
Aperture:f/4.8
Focal Length:8mm
Focal Length (35mm film equivalent):35mm
ISO speed:64

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