Hostname: page-component-74656f9884-npj9w Total loading time: 0 Render date: 2026-11-10T09:43:21.026Z Has data issue: false hasContentIssue false
  • English
  • Français

Tacharanite

Published online by Cambridge University Press:  05 July 2018

G. Cliff ,
J. A. Gard ,
G. W. Lorimer  and
H. F. W. Taylor
G. Cliff
Affiliation:
Department of Metallurgy, The University, Manchester, England
J. A. Gard
Affiliation:
Department of Chemistry, University of Aberdeen, Scotland
G. W. Lorimer
Affiliation:
Department of Metallurgy, The University, Manchester, England
H. F. W. Taylor
Affiliation:
Department of Chemistry, University of Aberdeen, Scotland
Get access Rights & Permissions [Opens in a new window]

Summary

Tacharanite has been re-examined using electron microscopy and diffraction, analytical microscopy, X-ray powder and fibre rotation photographs, and other methods. The composition approximates to Ca12Al2Si18O69H36, and the X-ray diffraction patterns can be referred to an A-centred monoclinic pseudo-cell with a 17·07, b 3·65, c 27·9 Å, β 114·1°, Z = 1. In the true cell b is certainly, and a and c probably, doubled. Small, reversible changes in pseudo-cell parameters occur on heating below 200°C, and parameters found by electron diffraction differ slightly from those found with X-rays, presumably due to shrinkage on dehydration in the high vacuum of the electron microscope. An earlier report that tacharanite changes into a mixture of tobermorite and gyrolite on standing in air is not confirmed. Tacharanite shows some important resemblances to tobermorite, but there are also significant differences.

Information

Type
Research Article
Information
Mineralogical Magazine , Volume 40 , Issue 310 , June 1975 , pp. 113 - 126
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1975

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.)

Article purchase

Temporarily unavailable

References

Cliff, (G.) and Lorimer, (G. W.), 1972. Proc. 5th Eur. Congr. Electron Microscopy, Manchester, 140.Google Scholar
Gard, (J. A.), 1971. The Electron-Optical Investigation of Clays (Gard, J. A., ed.) Ch. II, 45–55. Mineralogical Society, London.Google Scholar
Gard, (J. A.) and Taylor, (H. F. W.), 1957. Min. Mag. 31, 361.Google Scholar
Heller, (L.) and Taylor, (H. F. W.), 1956. Crystallographic Data for the Calcium Silicates. HMSO (London), 44.Google Scholar
Koritnig, (S.), 1972. Contr. Min. Petr. 35, 293.CrossRefGoogle Scholar
Livingstone, (A.), 1974. Min. Mag. 39, 820.CrossRefGoogle Scholar
Lorimer, (G. W.) and Champness, (P. E.), 1973. Amer. Min. 58, 243.Google Scholar
Lorimer, (G. W.), Nasir, (M. J.), Nicholson, (R. B.), Nuttall, (K.), Ward, (D. E.), and Webb, (J. R.), 1972. Proc. 5th Int. Mat. Syrup., Berkeley, 232.Google Scholar
Lucas, (J. H.), 1970. Proc. 7th Int. Conf. Electron Microsc. 1, 159.Google Scholar
Mcconnell, (J. D. C.), 1954. Min. Mag. 30, 293.Google Scholar
Mitstyda, (T.), 1973. Cement Concr. Res. 3, 71.CrossRefGoogle Scholar
Sabine, (P. A.) and Young, (B. R.), 1972. In Ann. Rep. for 1971, Inst. Geol. Sci. (London), 102.Google Scholar
Sabine, (P. A.) and Young, (B. R.), 1975. Phil. Trans. Ser. A (in press).Google Scholar
Swanson, (H. E.) and Fuyat, (R. K.), 1953. U.S. Bureau of Commerce, National Bureau of Standards Circular 539, 2, 20.Google Scholar
Sweet, (J. M.), 1961. Min. Mag. 32, 745.Google Scholar
Taylor, (H. F. W.), 1959. Proc. 6th Nat. Conf. Clays and Clay Minerals, Berkeley 1957, 101.CrossRefGoogle Scholar
Walker, (G. P. L.), 1971. West Commem. Vol. [Univ. Saugar, India], 181. [M.A. 72-3476].Google Scholar