This is from a quarry mining the Whitemud Formation in southern Saskatchewan. This layer is extracted from the top of a hill at the bottom of a valley. It is more than 50 meters below the table land above. The lumps are extremely dense and very heavy. They exhibit this horizontal layering, a clear indication of the sedimentary nature of the deposit. When I see this I know the clay is exceedingly fine particled. There are flecks of high-carbon material and some tiny iron particles. This lump is quite wet, about 12% water. When it dries out in breaks down into thousands of pure-white pieces, these slake quickly in water to create a creamy smooth slurry from which I can easily sieve out the carbon and iron particles.
Mother Nature's Porcelain Processing Method
How to Find and Test Your Own Native Clays
Some of the key tests needed to really understand what a clay is and what it can be used for can be done with inexpensive equipment and simple procedures. These practical tests can give you a better picture than a data sheet full of numbers.