(1701) I also observed in many grains of sand that their bodies consisted of incredibly thin scales or scaly parts .Among these gleaming grains of sand I also found some which did not emit any gleam at all , and when I broke those grains to pieces , no gleam could be seen on those pieces at all , and they resembled a brown - red dye .And in others there was not only a red substance , but among the latter there were also a hundred gleaming particles , all originating from one grain of sand .