Pollucite Value, Price, and Jewelry Information
Colorless pollucites lack fire when cut and are usually small. However, this very rare cesium mineral is a coveted collector's gem.
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Colorless pollucites lack fire when cut and are usually small. However, this very rare cesium mineral is a coveted collector’s gem.
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Not only is gem-quality pollucite very rare, it's also the only mineral which has Cs as an essential constituent. This mineral serves as the principal ore for cesium.
You're more likely to find this gem in mineral collections than in jewelry collections. However, recent gem-quality finds in Afghanistan could change that.
How Did Pollucite Get Its Name?
Discovered in 1846 in Elba, Italy, this mineral was named after Pollux, the twin brother of Castor in Classical mythology. (Helen of Troy and the ill-starred Clytemnestra were his sisters). The discoverers associated it with castorite, named after Castor, since both occurred in lithium-rich granite pegmatites at this source. Although castorite was later renamed petalite, the name pollucite remained.
Oddly enough, according to myth, Pollux was immortal while Castor was mortal. So, too, did the name "castorite" pass away. Furthermore, some myths claim the twins had different fathers, immortal Zeus and the mortal Tyndareus. So, though originally paired, these minerals proved to be distinct, too.
No known gem treatments.
Notable gem-quality sources include the following:
- United States: Gem material from various localities in Maine, including Newry and Mt. Mica, and Massachusetts; San Diego County, California; Middletown, Connecticut; Custer County, South Dakota: massive material in thick seams.
- Afghanistan; Bernie Lake, Manitoba, Canada; Finland; Elba, Italy; Kazakhstan; Pakistan; Karibib, Namibia; Varutrask, Sweden: massive lilac to white material (N = 1.518, SG 2.90).
These pollucites on matrix show blue-white fluorescence. 14.0 x 11.0 x 8.5 cm (largest pollucite crystal measures 7 cm across). Shengus area, Skardu Road, Gilgit Division, Pakistan. © Rob Lavinsky, www.iRocks.com. Used with permission.
Despite the existence of large beds at some localities, gems sizes are always very small, under 10 carats.
Opaque, whitish masses in South Dakota reach 3-4 feet in thickness but usually yield colorless, very small gems.
Maine material cuts stones from masses that reach up to 10 inches in size.
- Smithsonian Institution (Washington, DC): 8.5 (colorless, Maine); 7.0 (colorless, Connecticut).
- Private Collection: 3.85 (pinkish, Maine).
Note: In metal form, cesium is toxic, and the isotopes produced as nuclear waste or for medical purposes are radioactive. However, naturally occurring cesium, such as that found in pollucite gems, should pose no risks.
Joel E. Arem, Ph.D., FGA
Dr. Joel E. Arem has more than 60 years of experience in the world of gems and minerals. After obtaining his Ph.D. in Mineralogy from Harvard University, he has published numerous books that are still among the most widely used references and guidebooks on crystals, gems and minerals in the world.
Co-founder and President of numerous organizations, Dr. Arem has enjoyed a lifelong career in mineralogy and gemology. He has been a Smithsonian scientist and Curator, a consultant to many well-known companies and institutions, and a prolific author and speaker. Although his main activities have been as a gem cutter and dealer, his focus has always been education. joelarem.com
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