Hostname: page-component-78c5997874-m6dg7 Total loading time: 0 Render date: 2024-11-14T23:12:26.318Z Has data issue: false hasContentIssue false
  • English
  • Français

Straczekite, a new calcium barium potassium vanadate mineral from Wilson Springs, Arkansas

Published online by Cambridge University Press:  05 July 2018

Howard T. Evans Jr. ,
Gordon Nord ,
John Marinenko  and
Charles Milton
Howard T. Evans Jr.
Affiliation:
US Geological Survey, Reston, Virginia 22092, USA
Gordon Nord
Affiliation:
US Geological Survey, Reston, Virginia 22092, USA
John Marinenko
Affiliation:
US Geological Survey, Reston, Virginia 22092, USA
Charles Milton
Affiliation:
George Washington University, Washington DC 20006, USA
Get access Rights & Permissions [Opens in a new window]

Abstract

Straczekite, a new calcium barium potassium vanadate from Wilson Springs (formerly Potash Sulfur Springs), Arkansas, occurs as a rare secondary mineral in fibrous seams in gangue. The dark greenish-black crystals are very soft, thin laths up to 0.5 mm in length, forming thick masses. No single-crystal X-ray patterns could be obtained, but good electron diffraction patterns yielded a monoclinic unit cell in space group C2/m, C2, or Cm. The cell parameters were refined by least squares analysis of Guinier-Hägg X-ray powder data: a 11.679(2), b 3.6608(4), c 10.636(2)Å, β = 100.53(4)° (strongest lines are: 003, 3.486, 100; 001, 10.449, 50; 020 1.8306, 50; 01/510, 1.9437, 15; 111/03, 3.255, 10; 311/12, 2.492, 10; 021, 1.8030, 10). Chemical analysis yields the formula: (Ca0.39Ba0.31K0.33Na0.11)(V1.594+V6.315+Fe0.103+)O20.02(H2O)2.9. The calculated density is 3.21 g/cm3. The mineral conforms to a series of synthetic vanadium bronzes, typified by Ag1-xV2O5 of known structure. It represents a new series of layer vanadate minerals of general formula MxV8O20·yH2O, similar in properties but distinct from the hewettite series (MxV6O16·yH2O).

Type
Research Article
Information
Mineralogical Magazine , Volume 48 , Issue 347 , June 1984 , pp. 289 - 293
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1984

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

Andersson, S. (1965) Ada Chem. Scand. 19, 1371–5.CrossRefGoogle Scholar
Bachmann, H. G. (1962) Beitr. Mineral. Petrogr. 8, 210–14.Google Scholar
Bachmann, H. G. and Barnes, W. H. (1962) Can. Mineral. 7, 219–35.Google Scholar
Hollingsworth, J. S. (1967) Geology of the Wilson Springs Vanadium Deposits. Geol. Soc. Am. Central Arkansas Field Conf. Guide Book, 22–8.Google Scholar
Pabst, A. (1979) Am. Mineral. 64, 713–20.Google Scholar
Pouchard, M., and Hagenmuller, P. (1967) Materials Res. Bull. 2, 799–808.CrossRefGoogle Scholar
Qurashi, M. (1961) Can. Mineral. 6, 647–62.Google Scholar
Vidonne, A., Theobald, F., and Bernard, J. (1971) CR Acad. Sci. Paris, 272C, 1039–41.Google Scholar
Wadsley, A. D. (1957) Acta Crystallogr. 10, 261–7.CrossRefGoogle Scholar
Weeks, A. D., Ross, D. R., and Martin, R. F. (1963) Am. Mineral. 48, 1187–95.Google Scholar