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Neue ZnS-Polytypen (9R, 12R und 21R) in mesozoischen Sedimenten NW-Deutschlands

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Summary

Argillaceous sediments of jurassic and lower cretaceous age in NW-Germany contain in several localities authigenous ZnS-polytypes. The crystals with a maximum height of 2 mm exhibit hexagonal-pyramidal and trigonal-pyramidal habit.

With X-ray rotation and precession technique the following polytypes could be identified: Sphalerite (3 R = 3 C) 211, 411, 6H 9R, 12R, 15R and 21R.

The 9 R-, 12 R- and 21 R-polytypes have not until now been described elsewhere.

The structures of the new polytypes were determined as 9R=(21), 12R=(13) and 21R=(3112).

Oriented intergrowths of R- and H-polytypes were frequently observed. From the intergrowth-phenomena arguments for the environmental conditions of formation can be deducted.[/p]

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Authors and Affiliations

  1. Mineralogisch-Petrographisches Institut der Universität, 74 Tübingen, 56, Wilhelmstraße

    Siegfried Haussühl &  German Müller

Authors
  1. Siegfried Haussühl
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  2. German Müller
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Haussühl, S., Müller, G. Neue ZnS-Polytypen (9R, 12R und 21R) in mesozoischen Sedimenten NW-Deutschlands. Beitr Mineral u Petrogr 9, 28–39 (1963). https://doi.org/10.1007/BF01138618

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  • DOI: https://doi.org/10.1007/BF01138618

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