Boltwoodite on Gypsum Matrix from China
Weight: 4.9 grams
Locality: Dongchuan Kunming Yunnan China
This specimen might not be detectible with an economical beta/gamma detecting counter, but it does emit alpha particles resulting in a count above 600CPM with the GQ-GMC-600 pancake tube.
Boltwoodite is a rare mineral belonging to the uranyl silicate hydrate group. It is named after Charles Boltwood, an American chemist. Boltwoodite typically occurs as small, prismatic to tabular crystals or as coatings on the surface of other minerals. When found on a gypsum matrix, it forms an interesting and visually appealing combination.
In terms of its composition, Yellow Boltwoodite contains uranium, calcium, silicon, oxygen, and water molecules. Its formation is associated with hydrothermal processes involving the leaching of uranium-bearing minerals and subsequent precipitation in fractures and cavities. Gypsum, a common evaporite mineral, often serves as a host rock for Yellow Boltwoodite crystals.
Shipped with USPS First Class only in polyethylene and bubble wrap in a box big enough to bring the parcel surface activity well below the 0.5mR/hr shipping limit.
The buyer must assume responsibility for this item and use it according to its intended purpose. Keep this away from children and store it at least three feet from anywhere anyone spends a lot of time.
This listing meets the requirements of NRC 10 CFR 40.22
It also meets U.S.P.S domestic shipping requirements for exempt limited quantities of class 7 materials according to –347.22 “are eligible under 49 CFR to be shipped as excepted packages for limited quantities” and –Exhibit 347.22 Activity Limits– and also –173.435– Table of A1 and A2 values
This item will conform to the USPS shipping restrictions when shipped.
Geiger counter not included.
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