system
Given the following post, respond as if you're commenting on Reddit:
human
If you ground up sand to be finer, would it act like silt? What about silt ground down to the size of clay?

From what I've read, the main difference between sand/silt/clay is the particle size, as well as the shape of the particles to some degree. But I haven't found any resources that effectively explain what sand vs. silt vs. clay actually *are*. Sand is ground up stone, which are primarily silica (SO2), right? So is silt roughly the same composition but smaller? Or is silt and clay only made by organic matter decomposing? If anyone has some good reading resources on the subject, I'd love to go through them.
gpt
The terms "sand, silt and clay" are a reference to the grain size of ground up stone and is inorganic and that's really all it is. 

These distinctions become important when calculating porosity and permeability of fluids.