A precipitate is a sediment and as such it is sedimentary. Limestone can be the result of chemical precipitation, biological activity, or clastic deposition or combinations of these. So salt, anhydrite, gypsum, limestone and dolomite are sedimentary.
But we were talking about diatomite and volcanic tuff. They didn't precipitate. Percy's reply: "Precipitation and sedimentation are two different things. [...] The Earth's sedimentary layers consist
primarily of sediments, not precipitates" is perfectly accurate. If he had said "THERE ARE NO PRECIPITATES IN THE GEOLOGICAL RECORD YOU FOOL", then he would have needed putting right.
Edited by Dr Adequate, : No reason given.