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First find of coesite in the ultrahigh-pressure metamorphic area of the central Erzgebirge, Germany

Institut für Mineralogie und Kristallchemie, Universität Stuttgart, Azenbergstr. 18, D-70174 Stuttgart, Germany

View larger version (66K): [in this window] [in a new window]   Fig. 1. Geological map of the eastern section of the Saidenbach reservoir area. The inset, simplified after Krohe (1996), shows the position of this area and the major crystalline units of the Erzgebirge.

View larger version (82K): [in this window] [in a new window]   Fig. 3. Coesite inclusion in garnet of eclogite sample E99–24. a. Photomicrograph, plane polarized light. The coesite crystal in the centre of the picture is partially replaced by a rim of quartz. The semi-opaque inclusion in coesite is rutile. Scale bar represents 50 µm. b. Backscattered-electron image of the same object, obtained with a CAMECA SX50 electron microprobe. c. Cathodoluminescence image of the same object.

View larger version (120K): [in this window] [in a new window]   Fig. 2. Coesite inclusion in omphacite of eclogite sample E99–24 as seen in plane polarized light. The scale bar in the lower left corner of the photomicrograph is 20 µm. Only the outermost rim of the coesite crystal is replaced by quartz.