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Yellowcatite, KNaFe3+2(Se4+O3)2(V5+2O7)·7H2O, the first selenite-vanadate

Published online by Cambridge University Press:  14 January 2025

Anthony R. Kampf*
Affiliation:
Mineral Sciences Department, Natural History Museum of Los Angeles County, Los Angeles, CA, USA
Travis Olds
Affiliation:
Section of Minerals and Earth Sciences, Carnegie Museum of Natural History, Pittsburgh, PA, USA
Chi Ma
Affiliation:
Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, USA
Joe Marty
Affiliation:
Mineral Sciences Department, Natural History Museum of Los Angeles County, Los Angeles, CA, USA
*
Corresponding author: Anthony Kampf; Email: akampf@nhm.org

Abstract

The new mineral yellowcatite (IMA2024-030), KNaFe3+2(Se4+O3)2(V5+2O7)·7H2O, was found underground in the School Section #32 mine, Grand County, Utah, USA, where it is a secondary, post-mining phase occurring on montroseite-corvusite-asphaltite-mica-bearing sandstone in association with barnesite, gypsum and mandarinoite. Crystals are thin hexagonal plates, up to ∼0.2 mm in diameter. Crystals are yellow and transparent, with vitreous to pearly lustre and pale-yellow streak. The mineral is brittle with curved fracture and two cleavages: perfect on {001} and good on {100}. The Mohs hardness is ∼2. The measured density is 2.79(2) g·cm–3. Optically, yellowcatite is uniaxial (–) with ω = 1.910(5) and ε = 1.740(5) (white light). The mineral is pleochroic with O yellow and E colourless; O > E. The empirical formula is (K0.650.35)Σ1.00(Na0.66Mg0.30)Σ0.96Fe3+2.02Se4+1.99V5+2.01O20H14.02. Yellowcatite is hexagonal, space group P$\bar 6$m2, with cell parameters: a = 5.4966(7), c = 17.2109(16) Å, V = 450.31(13) Å3 and Z = 1. In the crystal structure of yellowcatite (R1 = 5.12% for 281 I > 2σI reflections), Fe3+O6 octahedra, Se4+O3 pyramids and V5+O4 tetrahedra link by corner-sharing to form sheets similar to those in the well-known merwinite structure, but with the apices of the Se4+O3 pyramids in the ‘pinwheels’ pointing in the same direction as the V5+O4 tetrahedra. The unshared vertices of the V5+O4 tetrahedra in adjacent sheets link to one another to form divanadate groups, thereby joining two sheets into a double-sheet slab structural unit. Between adjacent slabs is a layer of unlinked Na(H2O)6 coordinations that are presumed to represent octahedra exhibiting rotational disorder.

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Copyright
© The Author(s), 2025. Published by Cambridge University Press on behalf of The Mineralogical Society of the United Kingdom and Ireland.

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Footnotes

Associate Editor: David Hibbs

References

Beath, O.A. (1943) Toxic vegetation growing on the salt wash sandstone member of the Morrison formation. American Journal of Botany, 30, 698707.CrossRefGoogle Scholar
Cannon, H.L. (1964) Geochemistry of rocks and related soils and vegetation in the Yellow Cat area, Grand County, Utah (No. 1176–1179). US Government Printing Office, USA.Google Scholar
Carter, W.D. and Gualtieri, J.L. (1965) Geology and uranium–vanadium deposits of the La Sal quadrangle, San Juan County, Utah, and Montrose County, Colorado. United States Geological Survey Professional Paper, 508. USGS, Colorada, USA.Google Scholar
Ferraris, G. and Ivaldi, G. (1988) Bond valence vs. bond length in O···O hydrogen bonds. Acta Crystallographica, B44, 341344.10.1107/S0108768188001648CrossRefGoogle Scholar
Gagné, O.C. and F.C, Hawthorne (2015) Comprehensive derivation of bond-valence parameters for ion pairs involving oxygen. Acta Crystallographica, B71, 562578.Google Scholar
Hall, S.M., Van Gosen, B.S. and Zielinski, R.A. (2023) Sandstone-hosted uranium deposits of the Colorado Plateau, USA. Ore Geology Reviews, 155, 105353.10.1016/j.oregeorev.2023.105353CrossRefGoogle Scholar
Higashi, T. (2001) ABSCOR. Rigaku Corporation, Tokyo.Google Scholar
Kampf, A.R., Olds, T.A., Ma, C. and Marty, J. (2024) Yellowcatite, IMA 2024-030. CNMNC Newsletter 81. Mineralogical Magazine, 88, doi:10.1180/mgm.2024.77Google Scholar
Lafuente, B., Downs, R.T., Yang, H., Stone, N., Armbruster, T. and Danisi, R.M. (2015) The power of databases: the RRUFF project. Highlights in Mineralogical Crystallography, 1, 25.Google Scholar
Libowitzky, E. (1999) Correlation of O–H stretching frequencies and O–H···O hydrogen bond lengths in minerals. Monatshefte für Chemie, 130, 10471059.CrossRefGoogle Scholar
Mandarino, J.A. (2007) The Gladstone–Dale compatibility of minerals and its use in selecting mineral species for further study. The Canadian Mineralogist, 45, 13071324.CrossRefGoogle Scholar
Moore, P.B. (1973) Bracelets and pinwheels: A topological-geometrical approach to the calcium orthosilicate and alkali sulfate structures. American Mineralogist, 58, 3242.Google Scholar
Shawe, D.R. (2011) Uranium-vanadium deposits of the Slick Rock district, Colorado. United States Geological Survey Professional Paper, 576-F. USGS, Colorada, USA.10.3133/pp576FCrossRefGoogle Scholar
Sheldrick, G.M. (2015a) SHELXT – Integrated space-group and crystal-structure determination. Acta Crystallographica, A71, 38.Google Scholar
Sheldrick, G.M. (2015b) Crystal structure refinement with SHELX. Acta Crystallographica, C71, 38.Google Scholar
Shoemaker, E.M., Miesch, A.T., Newman, W.L. and Riley, L.B. (1959) Part 3. Elemental composition of Colorado Plateau sandstone-type uranium deposits in Geochemistry and mineralogy of the Colorado Plateau uranium ores. United States Geological Survey Professional Paper, 320, 2554.Google Scholar
Stokes, W.L. (1952) Uranium-vanadium deposits of the Thompsons area, Grand County, Utah, with emphasis on the origin of the carnotite ores. Utah Geological and Mineral Survey Bulletin, 46, 51.Google Scholar
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