Definition

1. Noun:
   • A dark grey volcanic rock: Andesite is a type of fine-grained, extrusive igneous rock, typically of intermediate composition. It is commonly found in volcanic arcs associated with subduction zones.

Usage Examples

• Noun:
  • The mountain's core is composed primarily of andesite.
  • Geologists collected samples of the dark grey andesite for analysis.

Advanced Usage

• In geological contexts: The term is used to describe a specific rock type within the classification of igneous rocks, often in discussions of magma composition, volcanic activity, and plate tectonics.
  • The andesite lava flow exhibited a blocky texture.

Variants and Related Words

• Andesitic (adj): Pertaining to or having the composition of andesite.
  • The magma had an andesitic composition.

Synonyms

• Volcanic rock (general term)
• Intermediate igneous rock (technical classification)

Related Terms (Not Phrasal Verbs or Idioms)

• Dacite: A volcanic rock similar to andesite but with higher silica content.
• Basalt: A darker, more mafic volcanic rock.
• Subduction zone: A tectonic setting commonly associated with andesite formation.

Noun

1. a dark grey volcanic rock