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Cotta Sandstone
Cotta Sandstone ((ドイツ語:Cottaer Sandstein), also called ''Mittelquader''), is found in the Elbe Valley and in its numerous tributary valleys. Its main deposit lies in the west of the Elbe Sandstone Mountains, where it runs up to the Bohemian border, ending south of Pirna. It is named after the village of Cotta in the borough of Dohma, an area where the stone is quarried.
== Formation and properties ==
Cotta Sandstone was formed in the Cretaceous, in the Lower Turonian age. It is one of the Elbe sandstones and its colours range from whitish to grey and yellowish grey. In the south of the area Cotta Sandstone is medium-grained, whilst, in the north it is fine-grained. Around the village of Cotta itself the grain size is evenly sized at 0.1 to 0.22 millimetres and only very rarely as large as 0.3 millimetres. The rock contains the smallest elements of mica minerals (glauconite), decomposed feldspar and carbon elements. The carbon particles are arranged in clearly recognisable veins. They occasionally resemble marble textures.
The technical value of this natural stone varies considerably, because the quartz grains of Cotta Sandstone are frequentlysiliceously bonded, but it has many unevenly divided deposits of the phyllosilicates, illite and kaolinite.〔Siegfried Grunert: ''Der Elbsandstein: Vorkommen, Verwendung, Eigenschaften''. In: Geologica Saxonica Journal of Central European Geology 52/53 (2007)〕
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