Estuarine Sandstone (1kg)
A fine grained sandstone formed in estuarine (river mouth) conditions, composed of fine quartz and mica. Available by weight in 1 kilo bags with an information label.
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. Samples come by weight in bags of 1 kilo, sizes will vary.