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URANINITE
Allen #2 Mine, Red Canyon District, San Juan County, Utah
A very wide vein (up to 1 1/4” wide) of black Uraninite runs through the center of the specimen, bordered on both sides with small amounts of rock matrix.   This specimen is from the collection of Dr. Eugene B. Gross.  Dr. Gross worked for the A.E.C. during the “uranium rush” of the 1950’s to early 1960’s, and collected a substantial amount of Uraninite and other uranium-bearing minerals that were available at that time – specimens no longer available 50+ years after that era when most of the 1950’s mines  are no longer in existence.
mR/hr @ 1:  > 50
CPM @ 1:    > 30,000
Specimen size:  Entire specimen, including the matrix:  5 1/4” X 3 3/8” X 3”.
Uraninite vein size:  approximately 3 3/8” in cross section, and up to 1 1/4” thick.
Specimen weight:  1,268.00 grams
Price calculation:
List price:  1,268.00 grams X 50c / gram = $634.00
Discount price:  $634.00 – 20% quantity discount = $507.00.   Net price:  $500.00
Order Item MI-1509

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BOLTWOODITE 
Rössing Mine, between Rössing  & Arandis, Swakopmund District, Namibia
The Rössing Mine is a huge open pit uranium mine discovered in 1928, with a recent annual production of 3-4,000 tons of uranium ore.  According to MINDAT, the lifetime of the mine is expected to extend beyond 2020.  The Rössing Mine is located in the Namib Desert area south of Arandis, about 70 km north-east of Swakopmund.  With the large tonnage of uranium ore being produced annually, one might wonder why more specimens are not on the market.  The aerial view of the Rössing Mine workings shown on MINDAT reveals that this operation is an absolutely huge open pit mine, so it is highly unlikely that the mining company allows collecting on the site by the miners!  The specimens offered here were purchased from an American geologist who worked at the Rossing Mine as a consultant during 1996, and personally collected the specimens.

The Rössing Mine is perhaps the best known locality for Boltwoodite specimens, worldwide!  Boltwoodite is an uncommon hydrous potassium uranium silicate.  It forms as bright yellow-golden color hemispherical aggregates (to 5 mm across), composed of radially structured acicular Boltwoodite crystal groups, scattered across the front of the matrix, or as compact aggregates composed of tightly intergrown, radially structured needles filling open vuggy areas in the matrix.  Small, dark brown scalenohedral crystals of Calcite are often associated, deposited upon the matrix before the Boltwoodite.  Secondary, drusy colorless rhombohedral Calcite xls. are also often present, sometimes completely covering the Boltwoodite like a coating of transparent ice!  Other minerals which may be found on some of these specimens include small amounts of  β-Uranophane, and micro Quartz xls.   Boltwoodite is fluorescent dull orange under both SW and LW UV, with the strongest response under LW.

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