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Mineralogy pp 493Cite as

Syntaxy

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Part of the book series: Encyclopedia of Earth Science ((EESS))

In its original meaning, the term “syntaxy,” coined by Ungemach (1935b) by analogy with “epitaxy” (q.v.), referred to the oriented intergrowth of two polymorphic forms of one and the same chemical substance in which the ratios of corresponding cell edges are rational. As an example of syntactic intergrowth, two (or more) polymorphs of silicon carbide can crystallize together in a single edifice, in which a cell (simple or multiple) of one polymorph nearly coincides in shape and size with a cell of another polymorph. This is a case of three-dimensional structural control. Another example is provided by coquimbite and paracoquimbite , Fe2(SO4)3·9H2O.

Syntactic intergrowth also occurs with constituent substances that are chemically different, and the meaning of syntaxy has been extended accordingly (Donnay and Donnay, 1953). In the series bastnaesite (CeFCO3)– parisite (2CeFCO3·CaCO3) – roentgenite (3Ce FCO3·2CaCO3) – synchisite (CeFCO3·CaCO3)– vaterite (CaCO3), syntactic intergrowth has...

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References

  • Donnay, G., and Donnay, J. D. H., 1953. The crystallography of bastnaesite, parisite, roentgenite, and synchisite, Am. Mineralogist, 38, 932–963.

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  • Goldsztaub, S., 1935. FrDéshydratation de la goethite, Bull. Soc. fr. Minéral., 58, 42–43.

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  • Iitaka, Y., and Stalder, H. A., 1961. Synchisit and Bastnäsit aus dem Druckschacht des Kraftwerkes Oberaar, Schweiz. Mineral. Petrogr. Mitt., 41, 485–488.

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  • Ungemach, H., 1935a. Sur certains minéraux sulfatés du Chili, Bull. Soc. fr. Minéral., 58, 97–221.

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  • Ungemach, H., 1935b. Sur la syntaxie et al polytypie, Zeit. Kristallogr., 91, 1–22.

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Authors
  1. J. D. H. Donnay
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© 1981 Hutchinson Ross Publishing Company

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Donnay, J.D.H. (1981). Syntaxy . In: Mineralogy. Encyclopedia of Earth Science. Springer, Boston, MA. https://doi.org/10.1007/0-387-30720-6_138

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  • DOI: https://doi.org/10.1007/0-387-30720-6_138

  • Publisher Name: Springer, Boston, MA

  • Print ISBN: 978-0-87933-184-9

  • Online ISBN: 978-0-387-30720-6

  • eBook Packages: Springer Book Archive

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