Containing, resembling, relating to, or consisting of silica.(adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "siliceous" in a sentence
"The researchers found that while a vast majority of the minerals that make up ash are highly reactive and soon decay, about two percent by volume are made up of a stable group of minerals called siliceous aggregates."
"Consolidation through the concretion of substances dissolved in the sea is unlikely, for, in the first place, there are strata, such as siliceous matter, which are insoluble, and which could not therefore have been in solution; and, in the second place, the appearance of the strata is contrary to this supposition."
"Alpine bedrocks can be divided into two major groups: calcareous rocks and siliceous material."