Finchite, Sr(UO2)2(V2O8)·5H2O, a new uranyl sorovanadate with the francevillite anion topology

Spano, Tyler L.; Olds, Travis A.; Hall, Susan M.; Van Gosen, Bradley S.; Kampf, Anthony R.; Burns, Peter C.; Marty, Joe

doi:10.2138/am-2022-8365

Finchite, Sr(UO₂)₂(V₂O₈)·5H₂O, a new uranyl sorovanadate with the francevillite anion topology

Journal Article · Wed Feb 01 00:00:00 EST 2023 · American Mineralogist

DOI:https://doi.org/10.2138/am-2022-8365· OSTI ID:1928962

^[1]; ^[2]; Hall, Susan M. ^[3]; Van Gosen, Bradley S. ^[3]; ^[4]; ^[5]; Marty, Joe ^[6]

Univ. of Notre Dame, IN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Univ. of Notre Dame, IN (United States); Carnegie Museum of Natural History, Pittsburgh, PA (United States)
US Geological Survey, Denver, CO (United States)
Natural History Museum of Los Angeles County, Los Angeles, CA (United States)
Univ. of Notre Dame, IN (United States)
Salt Lake City, UT (United States)

Finchite (IMA2017-052), Sr(UO₂)₂(V₂O₈)·5H₂O, is the first uranium mineral known to contain essential Sr. The new mineral occurs as yellow-green blades up to ~10 µm in length in surface outcrops of the calcrete-type uranium deposit at Sulfur Springs Draw, Martin County, Texas, U.S.A. Crystals of finchite were subsequently discovered underground in the Pandora mine, La Sal, San Juan County, Utah, U.S.A., as diamond-shaped golden-yellow crystals reaching up to 1 mm. In this work, the crystal structure of finchite from both localities was determined using single-crystal X-ray diffraction and is orthorhombic, Pcan, with a = 10.363(6) Å, b = 8.498(5) Å, c = 16.250(9) Å, V = 1431.0(13) Å³, Z = 4 (R₁ = 0.0555) from Sulfur Springs Draw; and a = 10.3898(16), b = 8.5326(14), c = 16.3765(3) Å, V = 1451.8(4) Å³, Z = 4 (R₁ = 0.0600) from the Pandora mine. Electron-probe microanalysis provided the empirical formula (Sr_0.88K_0.17Ca_0.10Mg_0.07Al_0.03Fe_0.02)_Σ1.20(UO₂)₂(V_2.08O₈)·5H₂O for crystals from Sulfur Springs Draw, and (Sr_0.50Ca_0.28Ba_0.22K_0.05)_Σ0.94(U_0.99O₂)₂(V_2.01O₈)·5H₂O for crystals from the Pandora mine, based on 17 O atoms per formula unit. The structure of finchite contains uranyl vanadate sheets based upon the francevillite topology. Finchite is a possible immobilization species for both uranium and the dangerous radionuclide ⁹⁰Sr because of the relative insolubility of uranyl vanadate minerals in water.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725; FG02-07ER15880

OSTI ID:: 1928962

Journal Information:: American Mineralogist, Journal Name: American Mineralogist Journal Issue: 2 Vol. 108; ISSN 0003-004X

Publisher:: Mineralogical Society of AmericaCopyright Statement

Country of Publication:: United States

Language:: English

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Finchite, Sr(UO2)2(V2O8)·5H2O, a new uranyl sorovanadate with the francevillite anion topology

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Finchite, Sr(UO₂)₂(V₂O₈)·5H₂O, a new uranyl sorovanadate with the francevillite anion topology