Yes I can ,all sand per say is not comprised mostly of quartz , silica sand is though .
There is ground quartz in all sand , it is the amount of it that makes up the different types . For example play sand that’s pure white and really soft is 100% silica. It has been broken down to a powder ( think icing sugar ), this is really bad to inhale it and very serious for birds.
Construction sand has many different sizes of rocks and gravel in it, it can be grit for our birds because there are rough stones in it , there is silica in it but the percentage of it is lower.It can look like beach sand .
This is what I’ve learned when I questioned someone’s sand choice in their duck run , I was told “ sand is sand !” This is not true as there are many different types of sands . Also if anyone tells you “ sand is not grit” again this is not true because rough construction sand can be grit .
Hope this helps