Definition

Adjective: Relating to, containing, or resembling silica (silicon dioxide, SiO₂). It describes materials that have a significant amount of silica in their composition or properties.

Usage

The adjective "silicious" is used to describe minerals, rocks, sediments, or other materials that are rich in silica. It is a technical term common in geology, chemistry, and materials science.

Examples

• The beach sand was notably silicious, making it ideal for glass manufacturing.
• Geologists identified the hard, white layer as a silicious sinter deposit from the hot springs.
• Certain sponges have a skeleton made of silicious spicules.

Advanced Usage

• Silicious Ooze: A type of deep-sea sediment composed primarily of the silica shells of microscopic organisms like radiolarians and diatoms.
  • The ocean floor in that region is covered by silicious ooze.

Variants and Related Words

• Siliceous (adj.): The more common spelling variant with identical meaning.
  • The cliff face consisted of siliceous shale.
• Silicic (adj.): Often used in chemistry to describe compounds or rocks rich in silica.
  • Granite is a common silicic rock.
• Siliciferous (adj.): Bearing or containing silica.
  • The siliciferous veins in the rock were clearly visible.

Synonyms

• Flinty: Resembling or containing flint (a form of silica).
• Cherty: Containing or resembling chert (a siliceous rock).

Notes on Meaning

While "silicious" primarily denotes the presence of silica, it can also imply the hard, brittle, or glass-like qualities characteristic of silica-rich materials. It is often used interchangeably with "siliceous," though "siliceous" is the predominant form in modern scientific literature.

Adjective

1. relating to or containing or resembling silica
   • gritrock is siliceous sandstone