3 ms·Diatomaceous earth is made out silicates, not crystalline silicon, which is what this is made out of.by XorNot 3y agoDiatomaceous earth is made out silicates, not crystalline silicon, which is what this is made out of.lazide 3y agoNotably, fine crystalline silica (aka silicon dioxide) is a problem in that it causes silicosis. Hopefully not an issue in this quantity though?thsksbd 3y ago... which will oxidize and become a silicate.