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


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.


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


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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

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