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A fine grained sandstone formed in estuarine (river mouth) conditions, composed of fine quartz and mica.
Estuarine sandstone as the name implies was laid down as fine cross bedded deposits at the mouths of rivers. Occasional marine incursions are evident from fossils & ripple bedding. Some of the fine beds are peppered with mica flakes. This example is from the Carboniferous of Derbyshire. Specimens are supplied in labelled card trays.