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UO2
Cubic
Uraninite, a uranium oxide mineral, was reported by Frondel (1970) from Sterling Hill. Only one crystal was known from the original occurrence. It was found as a lustrous black cube, approximately 12 mm on edge, surrounded by an alteration zone which included uranophane. The matrix is franklinite/ willemite ore with franklinite crystals up to 35 mm. Pink calcite encrusts the ore and contains abundant sphalerite and curved red fluorite (HU-#113290). Lead-isotope measurements gave an age of 955 (± 30) million years for the ore at Sterling Hill.
In 1989, a specimen of uraninite associated with green clinopyroxene altering to amphibole and fluorapatite was found on the Buckwheat Dump in Franklin. The uraninite, verified by use of X-ray diffraction techniques, was a 4 x 5 mm rectangular crystal with very high luster on broken surfaces.
Semiquantitative microprobe analysis found this uraninite to be highly thorian with U > Th > Ce. Other specimens, also with 4 mm crystals, but associated with pyroxene and feldspar, were found in the same year and place. Information concerning these occurrences was well summarized by Dean (1990).
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| Copyright © 1995 by Pete J. Dunn |
Website
by Herb Yeates
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Link
to homepage
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This
page created: January 11, 2001 |
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