I found a few tests online for dirt/soil. Found out that a lot of people eat dirt & clay!! I also found out that clay is the finer particles in dirt, so -yes, clay is a powder form. I did a couple quick test on the dirt I use. It's about 90.4% sand, 9.5% silt and about 0.1% clay.

I'm going to do a more controlled test because I was anxious to see the results. One test was staining, which a large amount of clay would stain more. The other test was the feel in the hand test. The silt would be soft, sand - grainy & clay - sticky.

The sand in my dirt is a smaller grain and not much of any large sand particles. The smaller particle size causes the dirt to retain moister longer.

I also used bleach. The site I found this test on was unclear of what was suppose be the out come of the test. I assume it was to see the organic material. I have no organic material in my dirt, but a few things blown in from sitting in the driveway for a couple of weeks.

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