hello hello ekaterina galina borisovna let's start with what kind of sands there are in general andy approach our main character, the creator of the sands - this is already, well, transformed material from previously such parent rocks that poured out in ancient times and now at under different conditions, these rocks were destroyed , forming sands of various compositions, perhaps there are minerals that are already distinguished from the rocks in terms of their composition. they also belong to those from which they were formed, this is it us almost ordinary, yes watering spar in quartz. they are also formed from granites from rocks of acidic composition. this means that galerites can be there with different compositions. here is the sand already enriched with glauconite. that is, it was some kind of shale that contained such a little green additive, but this is pure quartz sand with you. you see that in color they are very different quartz sand its origin in two, when the parent rocks were destroyed and there was no access to them, no water, no air granules sand. then they are less