containing, consisting of, or resembling silica.
growing in soil rich in silica.
Also, silicious [suh-lish-uhs] .

1650–60; < Latin siliceus of flint or limestone. See silex, -eous

nonsiliceous, adjective
nonsilicious, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
siliceous or silicious (sɪˈlɪʃəs)
1.  of, relating to, or containing abundant silica: siliceous deposits; a siliceous clay
2.  (of plants) growing in or needing soil rich in silica
silicious or silicious

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
siliceous   (sĭ-lĭsh'əs)  Pronunciation Key 
Resembling or containing silica.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The rest is carried to the surface and is deposited upon the surrounding
  landscape as siliceous sinter or geyserite.
The lateral ridges are approximately determined by siliceous shale.
Dark-gray and greenish siliceous argillite, locally calcareous with quartzite
  prominent locally.
When the silica rich water splashes out of a geyser, the siliceous sinter
  deposits are known as geyserite.
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