Hostname: page-component-586b7cd67f-t8hqh Total loading time: 0 Render date: 2024-11-27T19:22:53.808Z Has data issue: false hasContentIssue false
  • English
  • Français

New data on hemihedrite from Arizona

Published online by Cambridge University Press:  02 January 2018

B. Lafuente ,
R. T. Downs ,
M. J. Origlieri ,
K. J. Domanik ,
R. B. Gibbs  and
M. S. Rumsey
B. Lafuente*
Affiliation:
Department of Geosciences, University of Arizona, 1040 E. 4th Street, Tucson, AZ 85721-0077, Arizona, USA
R. T. Downs
Affiliation:
Department of Geosciences, University of Arizona, 1040 E. 4th Street, Tucson, AZ 85721-0077, Arizona, USA
M. J. Origlieri
Affiliation:
Department of Geosciences, University of Arizona, 1040 E. 4th Street, Tucson, AZ 85721-0077, Arizona, USA
K. J. Domanik
Affiliation:
Lunar and Planetary Laboratory, University of Arizona, 1629 E. University Blvd, Tucson, AZ. 85721-0092, Arizona, USA
R. B. Gibbs
Affiliation:
Department of Geosciences, University of Arizona, 1040 E. 4th Street, Tucson, AZ 85721-0077, Arizona, USA
M. S. Rumsey
Affiliation:
Department of Earth Sciences, Natural History Museum, Cromwell Road, London SW7 5BD, UK
*
*E-mail: [email protected]
Get access Rights & Permissions [Opens in a new window]

Abstract

Hemihedrite from the Florence Lead-Silver mine in Pinal County, Arizona, USA was first described and assigned the ideal chemical formula Pb10Zn(CrO4)6(SiO4)2F2, based upon a variety of chemical and crystal-structure analyses. The primary methods used to determine the fluorine content for hemihedrite were colorimetry, which resulted in values of F that were too high and inconsistent with the structural data, and infrared (IR) spectroscopic analysis that failed to detect OH or H2O. Our reinvestigation using electron microprobe analysis of the type material, and additional samples from the type locality, the Rat Tail claim, Arizona, and Nevada, reveals the absence of fluorine, while the presence of OH is confirmed by Raman spectroscopy. These findings suggest that the colorimetric determination of fluorine in the original description of hemihedrite probably misidentified F due to the interferences from PO4 and SO4, both found in our chemical analyses. As a consequence of these results, the study presented here proposes a redefinition of the chemical composition of hemihedrite to the ideal chemical formula Pb10Zn(CrO4)6(SiO4)2(OH)2. Hemihedrite is isotypic with iranite with substitution of Zn for Cu, and raygrantite with substitution of Cr for S. Structural data from a sample from the Rat Tail claim, Arizona, indicate that hemihedrite is triclinic in space group P1, a = 9.4891(7), b = 11.4242(8), c = 10.8155(7) Å, α = 120.368(2)°, β = 92.017(3)°, γ = 55.857(2)°, V = 784.88(9) Å3, Z= 1, consistent with previous investigations. The structure was refined from singlecrystal X-ray diffraction data to R1 = 0.022 for 5705 unique observed reflections, and the ideal chemical formula Pb10Zn(CrO4)6(SiO4)2(OH)2 was assumed during the refinement. Electron microprobe analyses of this sample yielded the empirical chemical formula Pb10.05(Zn0.91Mg0.02)∑ = 0.93(Cr5.98S0.01P0.01)∑ = 6.00 Si1.97O34H2.16 based on 34 O atoms and six (Cr + S + P) per unit cell.

Keywords

hemihedriteArizonaredefinitionelectron microprobe analysissingle-crystal structureiraniteOHfluorineRaman spectroscopy
Type
Research Article
Information
Mineralogical Magazine , Volume 81 , Issue 4 , August 2017 , pp. 1021 - 1030
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2017

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Anthony, J.W., Bideaux, R.A., Bladh, K.W. and Nichols, M.C. (1990) Handbook of Mineralogy. Mineral Data Publishing, Tucson Arizona, USA.Google Scholar
Bariand, P. and Poullen, J.F. (1980) Rare chromates from Seh-Changi, Iran. The Mineralogical Record, 11, 293–297.Google Scholar
Brese, N.E. and O'Keeffe, M. (1991) Bond-valence parameters for solids. Acta Crystallographica, B47, 192–197.CrossRefGoogle Scholar
Bruker (2004) APEX2, SAINT and SADABS. Bruker AXS Inc., Madison, Wisconsin, USA.Google Scholar
Cesbron, F. and Williams, S.A. (1980) Iranite-hémihédrite, bellite, phoenicochroite, vauquelinite et fornacite: synthese et nouvelles données. Bulletin de Minéralogie, 103, 469–77.CrossRefGoogle Scholar
Edwards, H.G.M., Vandenabeele, P., Jehlicka, J. and Benoy, T.J. (2014) An analytical Raman spectroscopic study of an important English oil painting of the 18th Century. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 118, 598–602.CrossRefGoogle ScholarPubMed
Evans, W.H. and Sergeant, G.A. (1967) The determination of small amounts of fluorine in rocks and minerals. Analyst (London), 92, 690–694.CrossRefGoogle Scholar
Ferrari, H.J., Geronimo, F.C. and Brancone, L.M. (1961) Calorimetric determination of microquantities of fluorine in organic compounds. Microchemical Journal, V, 617–624.CrossRefGoogle Scholar
Frost, R.L. (2004) Raman microscopy of selected chromate minerals. Journal of Raman Spectroscopy, 35, 153–158.CrossRefGoogle Scholar
Fuge, R. (1976) The automated colorimetric determin-ation of fluorine and chlorine in geological samples. Chemical Geology, 17, 37–3.CrossRefGoogle Scholar
Hall, A. and Walsh, J.N. (1969) A rapid method for the determination of fluorine in silicate rocks and minerals. Analytica Chimica Acta, 45, 341–342.CrossRefGoogle Scholar
Huang, P.M. and Jackson, M.L. (1967) Fluorine determination in minerals and rocks. American Mineralogist, 52, 1503–1507.Google Scholar
Huang, W.H. and Johns, W.D. (1967) The chlorine and fluorine contents of geochemical standards. Geochimica et Cosmochimica Acta, 31, 597–602.CrossRefGoogle Scholar
Lafuente, B., Downs, R.T., Yang, H. and Stone, N. (2015) The power of databases: the RRUFF project. Pp. 1–30 in: Highlights in Mineralogical Crystallography (T Armbruster and Danisi, R.M., editors). W De Gruyter, Berlin.Google Scholar
Libowitzky, E. (1999) Correlation of O-H stretching frequencies and O—H-0 hydrogen bond lengths in minerals. Monatshefte für Chemie, 130, 1047–1059.CrossRefGoogle Scholar
McLean, W.J. and Anthony, J.W (1970) The crystal structure of hemihedrite. The American Mineralogist, 55, 1103–1114.Google Scholar
Sheldrick, G.M. (2008) A short history of SHELX. Acta Crystallographica, A64, 112–122.CrossRefGoogle Scholar
Williams, S.A. and Anthony, J.W. (1970) Hemihedrite, a new mineral from Arizona. American Mineralogist, 55, 1088–1102.Google Scholar
Yang, H., Sano, J.L., Eichler, C., Downs, R.T and Costin, G. (2007) Iranite, CuPb10(CrO4)6(SiO4)2(OH)2, iso-morphous with hemihedrite. Acta Crystallographica, C63, i122-i124.Google Scholar
Yang, H., Andrade, M.B., Downs, R.T., Gibbs, R.B. and Jenkins, R.A. (2016) Raygrantite, Pb10Zn (SO4)6(SiO4)2(OH)2, a new mineral isostructural with iranite, from Big Horn Mountains, Maricopa County, Arizona, USA. The Canadian Mineralogist, 54, 625–634.CrossRefGoogle Scholar