

My kid and I found this simple chart. It says that white river rocks like the ones in the second pic are chert? Aren't they quartzite?
No crystals
No layers
No holes
Not glass
Cannot scrape sand off rock
Hard
Various colours; dull smooth surface
Edit: Reddit really compresses images a lot, huh? Here's where we found it. Thank you, kind redittor, for your sleuthing too!