gaize
A siliceous rock containing some clay in the Ardennes and Meuse Valley, France. A porous fine-grained micaceous glauconitic sandstone containing much soluble silica among the Cretaceous rocks of France and Belgium.
A siliceous rock containing some clay in the Ardennes and Meuse Valley, France. A porous fine-grained micaceous glauconitic sandstone containing much soluble silica among the Cretaceous rocks of France and Belgium.