Adjective
Of or pertaining to silica; containing silica, or partaking of its nature.
Source: Webster's dictionarygritrock is siliceous sandstone Source: Internet
Because of the historical use of flint, the word "flint" is used by some potters, especially in the US, to refer to siliceous materials that are not flint. Source: Internet
It is probably derived from sponge spicules or other siliceous organisms as water is expelled upwards during compaction. Source: Internet
Geologists can classify oil shales on the basis of their composition as carbonate -rich shales, siliceous shales, or cannel shales. Source: Internet