Crystals will set in a structural pattern of some kind, These are the following, but are not limited to round, bubble shaped, jagged, square, or elongated. There may be times when there are other minerals that grow with the quartzite.
My son said that they grow some of these at a farm somewhere. I don't know if that's true or not, but they are different than the milky white quartz that I see at the dig site. It's almost a smokey quartz type of crystal.