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NATURAL POLLUCITE

Natural Pollucite

Taywiga Phataphol B.Sc., G.G.

GGT Laboratory

GGT Laboratory recently had the opportunity to examine natural pollucite from Mr. Haj (Jamal Gems), said to be from Afghanistan. The pollucite sample was colorless; pear shape cut and weighed 10.11 cts.


Figure 1: 10.11 cts. Natural Pollucite

Standard gemological testing gave the following results: RI – 1.52, single refractive; hydrostatic SG – 2.90; florescence – strong blue to short wave UV and medium blue to long wave UV. Microscopic magnification revealed crystal inclusions. We also performed infrared spectroscopy. The FTIR spectra showed broad absorption approx. 5162-5323 cm -1 and 3120-4138 cm -1 and a band at 4720 cm -1.



Figure 2: FTIR spectra of Pollucite

All these results proved that the sample was natural pollucite. This is similar to what was reported by GIA Laboratory. (see details Gems & Gemology Summer 2009 pp.150-151) Without the presence of natural inclusions, testing with standard instruments solely would not be easy to separate between pollucite and glass. Using FTIR spectroscopy can provide important information to verify the sample.

 

Reference:

Erica Emerson, Paul Johnson (2009) Gem News: Colorless petalite and pollucite from Laghman, Afghanistan. Gem & Gemology, Vol. 45, No. 2, pp. 150-151.

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