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Calciodelrioite, Ca(VO3)2(H2O)4, the Ca analogue of delrioite, Sr(VO3)2(H2O)4

Published online by Cambridge University Press:  05 July 2018

A. R. Kampf ,
J. Marty ,
B. P. Nash ,
J. Plášil ,
A. V. Kasatkin  and
R. Škoda
A. R. Kampf*
Affiliation:
Mineral Sciences Department, Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, California 90007, USA
J. Marty
Affiliation:
5199 E. Silver Oak Road, Salt Lake City, Utah 84108, USA
B. P. Nash
Affiliation:
Department of Geology and Geophysics, University of Utah, Salt Lake City, Utah 84112, USA
J. Plášil
Affiliation:
Institute of Physics ASCR, v.v.i., Na Slovance 2, 18221 Praha, Czech Republic
A. V. Kasatkin
Affiliation:
V/O ‘‘Almazjuvelirexport’’, Ostozhenka str., 22, block 1, 119034 Moscow, Russia
R. Škoda
Affiliation:
Department of Geological Sciences, Faculty of Science, Masaryk University, Kotlářská 2, 61137, Brno, Czech Republic
*
*E-mail: akampf@nhm.org
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Abstract

Calciodelrioite, ideally Ca(VO3)2(H2O)4, is a new mineral (IMA 2012-031) from the uraniumvanadium deposits of the eastern Colorado Plateau in the USA. The type locality is the West Sunday mine, Slick Rock district, San Miguel County, Colorado.The new mineral occurs on fracture surfaces in corvusite- and montroseite-impregnated sandstone and forms as a result of the oxidative alteration of these phases. At the West Sunday mine, calciodelrioite is associated with celestine, gypsum, huemulite, metarossite, pascoite and rossite. Themineral occurs as transparent colourless needles, bundles of tan to brown needles and star bursts of nearly black broad blades composed of tightly intergrown needles. Crystals are elongate and striated parallel to [100], exhibiting the prismatic forms {001} and {011} and having terminationspossibly composed of the forms {100} and {61}. The mineral is transparent and has a white streak, subadamantine lustre, Mohs hardness of about 2½, brittle tenacity, irregular to splintery fracture, one perfect cleavage on {001} and possibly one or more additional cleavages parallel to [100].Calciodelrioite is soluble in water. The calculated density is 2.451 g cm– 3. It is optically biaxial (+) with α = 1.733(3), β = 1.775(3), γ = 1.825(3) (white light), 2Vmeas = 87.3(9)° and 2Vcalc = 87°. The optical orientationis X = b; Z ≈ a. No pleochroism was observed. Electronmicroprobe analyses of two calciodelrioite samples and type delrioite provided the empirical formulae (Ca0.88Sr0.07Na0.04K0.01)Σ1.00(V1.00O3)2(H2.01O)4,(Ca0.76Sr0.21Na0.01)Σ0.98(V1.00O3)2(H2.01O)4 and (Sr0.67Ca0.32)Σ0.99(V1.00O3)2(H2.00O)4, respectively.Calciodelrioite is monoclinic, I2/a, with unit-cell parameters a = 14.6389(10), b = 6.9591(4), c = 17.052(2) Å, β = 102.568(9)°, V = 1695.5(3) Å3 and Z = 8. The seven strongest lines in the X-ray powder diffractionpattern [listed as dobs Å (I)(hkl)] are as follows: 6.450(100)(011); 4.350(16)(013); 3.489(18)(020); 3.215(17)(022); 3.027(50)(multiple); 2.560(28)(15,413); 1.786(18)(028). In the structure of calciodelrioite (refined to R1 = 3.14% for1216 Fo > 4σF), V5+O5 polyhedra link by sharing edges to form a zigzag divanadate [VO3] chain along a, similar to that in the structure of rossite. The chains are linked via bonds to Ca atoms, which also bond to H2Ogroups, yielding CaO3(H2O)6 polyhedra. The Ca polyhedra form a chain along b. Each of the two symmetrically independent VO5 polyhedra has two short vanadyl bonds and three long equatorial bonds. Calciodelrioite and delrioite are isostructuraland are the endmembers of the series Ca(VO3)2(H2O)4–Sr(VO3)2(H2O)4. Calciodelrioite is dimorphous with rossite, which has a similar structure; however, the smaller 8-coordinate Ca site in rossitedoes not accommodate Sr.

Keywords

calciodelrioitenew mineralcrystal structuredivanadate chaindelrioiterossiteWest Sunday mineColoradoUSA
Type
Research Article
Information
Mineralogical Magazine , Volume 76 , Issue 7 , December 2012 , pp. 2803 - 2817
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2016

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References

Ahmed, F.R. and Barnes, W.H. (1963) The crystal structure of rossite. The Canadian Mineralogist, 7, 713–726.Google Scholar
Brown, I.D. and Altermatt, D. (1985) Bond-valence parameters from a systematic analysis of the inorganic crystal structure database. Acta Crystallographica, B41, 244–247.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. US Geological Survey Professional Paper, 508. US Geological Survey, Reston, Virginia, USA, 82 pp.Google Scholar
Evans, H.T. and Garrels, R.M. (1958) Thermodynamic equilibria of vanadium in aqueous systems as applied to the interpretation of the Colorado Plateau ore deposits. Geochimica et Cosmochimica Acta, 15, 131–149.CrossRefGoogle Scholar
Friedel, C. and Cumenge, E. (1899) Sur un nouveau minerai d’urane, la carnotite. Comptes rendus de l’Académie des sciences, 128, 532–534.Google Scholar
Gunter, M.E., Bandli, B.R., Bloss, F.D., Evans, S.H., Su, S.C. and Weaver, R. (2004) Results from a McCrone spindle stage short course, a new version of EXCALIBR, and how to build a spindle stage. The Microscope, 52, 23–39.Google Scholar
Hawthorne, F.C. (1983) Graphical enumeration of polyhedral clusters. Acta Crystallographica, A39, 724–736.Google Scholar
Hess, F.L. and Schaller, W.T. (1914) Pintadoite and uvanite, two new vanadium minerals from Utah: a preliminary note. Journal of the Washington Academy of Science, 4, 576–579.Google Scholar
Hostetler, P.B. and Garrels, R.M. (1962) Transportation and precipitation of uranium and vanadium at low temperatures, with special reference to sandstonetype uranium deposits. Economic Geology, 57, 137–167.CrossRefGoogle Scholar
Mandarino, J.A. (1981) The Gladstone-Dale relationship: part IV. The compatibility concept and its application. The Canadian Mineralogist, 19, 441–450.Google Scholar
Palache, C., Berman, H. and Frondel, C. (1951) Dana’s System of Mineralogy, 7th edition, volume II. John Wiley and Sons, New York.Google Scholar
Pouchou, J.-L. and Pichoir, F. (1991) Quantitative analysis of homogeneous or stratified microvolumes applying the model ‘PAP’. Pp. 31–75.in: Electron Probe Quantitation (K.F.J. Heinrich and D.E. Newbury, editors). Plenum Press, New York.Google Scholar
Schindler, M., Hawthorne, F.C. and Baur, W.H. (2000a) A crystal-chemical approach to the composition and occurrence of vanadium minerals. The Canadian Mineralogist, 38, 1443–1456.CrossRefGoogle Scholar
Schindler, M., Hawthorne, F.C. and Baur, W.H. (2000b) Crystal-chemical aspects of vanadium: polyhedral geometries, characteristic bond valences, and polymerization of (VOn) polyhedra. Chemistry of Materials, 12, 1248–1259.CrossRefGoogle Scholar
Shawe, D.R. (2011) Uranium-vanadium deposits of the Slick Rock district, Colorado. US Geological Survey Professional Paper, 576-F. US Geological Survey, Reston, Virginia, USA, 80 pp.Google Scholar
Sheldrick, G.M. (2008) A short history of SHELX. Acta Crystallographica, A64, 112–122.CrossRefGoogle Scholar
Smith, M.L. (1970) Delrioite and metadelrioite from Montrose County, Colorado. American Mineralogist, 55, 185–200.Google Scholar
Thompson, M.E. and Sherwood, A.M. (1959) Delrioite, a new calcium strontium vanadate from Colorado. American Mineralogist, 44, 261–264.Google Scholar
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