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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  SOLD
Order Item MI-1509

BOLTWOODITE 
Goanikontes Claim, Arandis, Swakopmund District, Erongo Region, Namibia
The revised name for this locality, formerly known as the Rössing Mine, is the Goanikontes Claim.  According to MINDAT, the Rössing Mine was previously thought to be the source of the Namibian Boltwoodite specimens,  but recently the true source of the crystallized Boltwoodite has been revealed.  The Goanikontes Claim is located 4 km SE of Goanikontes, and about 27 km E of Swakopmund.  The Goanikontes Claim is actually about 40 km from the Rossing Mine, the previously reported source of the fine Boltwoodite specimens!  If you have purchased Boltwoodite specimens from us in the past, labeled as having been found at the Rossing Mine, please revise your collection labels to reflect the new, corrected locality information.  The specimens offered here were purchased from an American geologist who worked in the district as a consultant during 1996.

 The Goanikontes Claim 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 (2 to 4 mm across), composed of radially structured acicular Boltwoodite crystal groups, scattered across the front of the matrix, as compact aggregates composed of tightly intergrown, radially structured needles filling open vuggy areas in the matrix, and / or as individual prismatic terminated crystals forming loosely aggregated sprays of bright yellow-golden prismatic crystals.  Small, dark brown scalenohedral crystals of Calcite are often associated, deposited upon the matrix before the Boltwoodite.  Secondary, drusy colorless Gypsum 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, Pyrolusite, and micro Quartz xls.   Boltwoodite is sometimes fluorescent a pale, dull orange color under both SW and LW UV, with the strongest response under LW.  The radioactivity of Boltwoodite is generally fairly low, as the amount of Boltwoodite present is not a significant part of the volume of each specimen.  NOTE:  The first three specimens, items MI-1716, 1717, and 1718 are particularly interesting for micromount preparation.

1730

1731

1732

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