Definition of silica in English:

silica

Line breaks: sil¦ica
Pronunciation: /ˈsɪlɪkə
 
/

noun

[mass noun]
A hard, unreactive, colourless compound which occurs as the mineral quartz and as a principal constituent of sandstone and other rocks.
  • Alternative name: silicon dioxide; chemical formula: SiO2
More 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

Pronunciation: /-ˈlɪʃəs/
(also silicious) adjective
More 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.

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