Definition

1. Noun:
   • A type of sandstone: "greensand" is an olive-green sandstone that contains the mineral glauconite.

Usage

• "Greensand" is used as a singular, uncountable noun to refer to this specific geological material. It is typically used in scientific, agricultural, and geological contexts.

Examples

• Noun:
  • The cliffs along the coast are composed of greensand.
  • Farmers sometimes use crushed greensand as a soil conditioner to add potassium.

Advanced Usage

• "Greensand" in filtration: In water treatment, "greensand" can refer to a filter medium made from this material, used to remove iron, manganese, and other substances.
  • The well water system uses a greensand filter to improve water quality.

Variants and Related Words

• Glauconite (n): The green mineral (a potassium iron silicate) that gives greensand its characteristic color and properties.
• Greensand marl (n phrase): A calcareous clay mixed with greensand.

Synonyms

• Glauconitic sandstone: A more technical synonym.
• Green sandstone: A descriptive synonym.

Noun

1. an olive-green sandstone containing glauconite