Share this entry

Share this page

silica

Syllabification: sil·i·ca
Pronunciation: /ˈsilikə
 
/

Definition of silica in English:

noun

A hard, unreactive, colorless compound that occurs as the mineral quartz and as a principal constituent of sandstone and other rocks.
Example sentences
  • Soluble silicates can be obtained by heating alkali metal carbonates and silica.
  • Quartz and sand are composed of silicon and oxygen alone: silicon dioxide, or silica.
  • Cristobalite is a crystalline form of silica that has a diamondlike structure.

Origin

early 19th century: from Latin silex, silic- 'flint', on the pattern of words such as alumina.

Derivatives

siliceous

1
Pronunciation: /səˈliSHəs/
(also silicious) adjective
Example sentences
  • Quartz is the dominant mineral in veins in siliceous rocks, calcite in limestones, and gypsum in gypsiferous sediments.
  • After initial fieldwork in 2000 we realized that the ‘upper siliceous zone’ can be further subdivided into two distinct siliceous horizons.
  • Tectonic ironstone encompasses siliceous and ferruginous rock types that are characterized by the presence of chert or cherty quartzite, iron sulphides and their alteration products.

Words that rhyme with silica

basilica

Definition of silica in:

Share this entry

Share this page

 

What do you find interesting about this word or phrase?

Comments that don't adhere to our Community Guidelines may be moderated or removed.

Get more from Oxford Dictionaries

Subscribe to remove ads and access premium resources

Word of the day terpsichorean
Pronunciation: ˌtərpsikəˈrēən
adjective
of or relating to dancing