Hi Sandi.
Sieving quartz sand was my own approach to getting six fractions, but I was surprised at how narrow the size distribution was in the "wild" sources I was trying.
The whole area around us is ancient sand dunes and I assumed there would be quite a spread of sizes.
It turns out that the geological processes that produced the dunes made about 90% of one particle range with a marked tail-off on both sides.
Not the uniform ie random sizes that I expected.
Regards
John
It's like doing jigsaw puzzles in the dark.
Enjoy today's problems, for tomorrow's may be worse.