Large synthetic crystals of alkaline earth metal fluorides, especially fluorite crystals, contain sometimes unknown small inclusions of hexagonal form. Samples of these crystals were investigated by microscope, X-ray, and microprobe analysis to identify the included small crystals. Optical behdviour of these inclusions, morphology, chemical composition, and the reaction with water allow their interpretation as high-temperature modifications of the anhydrous water soluble alkaline earth metal sulfates, partly transformed to the corresponding sulfides.Bei der Synthese groDer Kristalle der Erdalkalifluoride, insbesondere des Fluljspates entstehen unter besonderen Bedingungen in der Fluoridmatrix kleine, sechseckige Kristlllchen, die bisher nicht zweifelsfrei identifiziert werden konn ten.Die vorliegende Arbeit berichtet uber rnikroskopische, rontgenographische und MikrosondenUntersuchungen an diesen. Optisches Verhalten, Morphologie, Elementzusammensetzung und dic Reaktion mit Wasser konnen so gedeutet werden, daB es sich urspriinglich um wasserfreie. hexagonale Hochtemperatur-Modifikationen der wasserloslichen Erdalkalisulfate handelt, die teilweise in die entsprechenden Sulfide umgewandelt sind.
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