The habitus of gypsum crystals from Oligocene clay deposits as exposed in a lignite quarry at Zimmersrode (Hessen, Germany) is described and compared with literature data. Comparatively few twins were encountered; invariably, contact twins with growth face (100) were collected. Of prime importance for the genesis of gypsum is the weathering of pyrite and/or marcasite, which were not found in the quarry visited but observed in a nearby lignite pit at Neuenhain.

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Mededelingen van de Werkgroep voor Tertiaire en Kwartaire Geologie

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Werkgroep voor Tertiaire en Kwartaire Geologie

Hans L. Bongaerts, & Wim C.C. Rutten. (1990). Habitus of gypsum crystaks from the Oligocene of the Zimmersröder Graben (Hessen, Northern Germany). Mededelingen van de Werkgroep voor Tertiaire en Kwartaire Geologie, 27(4), 101–106.