Advertisement

Bulletin of Materials Science

, Volume 5, Issue 5, pp 399–404 | Cite as

Growth mechanism of Herring-Bone and Hour-glass synthetic gypsum

  • D Jayakumar
  • K S Raju
Article

Abstract

Synthetic gypsum crystals are grown from sodium meta silicate gel when 1M calcium chloride solution diffuses into the gel imbedded with 1M amonium sulphate solution. Acicular-shaped crystals of Herring-Bone structure are observed. When methanol was added to the gel medium, tabular crystals revealing Hour-glass structure are rarely observed. In the presence of methanol the silicate particles are inhibited from being incorporated into the crystals as a result of pushing and incorporating mechanisms. Inclusion of silicate particles in traces gives rise to Hour-glass pattern. The implications are discussed.

Keywords

Gel grown gypsum Herring-Bone structure Hour-glass structure synthetic gypsum 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Anon 1977–78Handbook of Chemistry and Physics (ed.) Robert C Weast (Ohio; CRC Press Inc), 58th edn., p. B-101Google Scholar
  2. Cady R D and Shanks H R 1972,J. Cryst. Growth 23 275CrossRefGoogle Scholar
  3. Henisch H K 1970Crystal Growth in Gels (Pennsylvania: University Press) Chap. 4, p. 73Google Scholar
  4. Henisch H K, Dennis J and Hanoka J I 1965,J. Phys. Chem. Solids 26 493CrossRefGoogle Scholar
  5. Kastner M 1970Am. Miner 55 2128Google Scholar
  6. Patel A R and Raju K S 1970J. Phys. Chem. Solids 31 331CrossRefGoogle Scholar
  7. Raju K S 1981J. Mater. Sci. 16 2512CrossRefGoogle Scholar
  8. Shearman D J 1981Geol. Mag. 118 303CrossRefGoogle Scholar
  9. Van Rosmalen G M, Marchee W G J and Bennema P 1976J. Cryst. Growth 35 169CrossRefGoogle Scholar

Copyright information

© the Indian Academy of Sciences 1983

Authors and Affiliations

  • D Jayakumar
    • 1
  • K S Raju
    • 1
    • 2
  1. 1.Department of Applied GeologyUniversity of Madras, Guindy CampusMadrasIndia
  2. 2.Department of Crystallography and BiophysicsIndia

Personalised recommendations