plagioclase

/'pleidʤioukleis/

Thân thiện

A geologist examines a sample of plagioclase under a magnifying glass.

Definition

1. Noun:
   • A type of feldspar mineral: "Plagioclase" refers to any member of a continuous series of common rock-forming minerals within the feldspar group. They are triclinic in crystal structure and range in composition from albite (sodium aluminum silicate) to anorthite (calcium aluminum silicate).

Usage Examples

• Noun:
  • The granite contained large crystals of white plagioclase.
  • Plagioclase is a major component of the Earth's crust.
  • Under the microscope, the zoned structure of the plagioclase was visible.

Advanced Usage

• In Petrology: The term is used to classify and describe igneous and metamorphic rocks based on the specific type and proportion of plagioclase present.
  • The basalt's composition was determined by analyzing its calcic plagioclase.
• In Series Context: Often discussed as the "plagioclase series" or "plagioclase feldspar series" to emphasize its continuous chemical variation.
  • The plagioclase in this sample is intermediate, belonging to the andesine variety.

Variants and Related Words

• Plagioclastic (adj): Pertaining to or characterized by plagioclase.
  • The rock had a plagioclastic texture.
• Albite (n): The sodium-rich endmember of the plagioclase series.
• Anorthite (n): The calcium-rich endmember of the plagioclase series.
• Feldspar (n): The broader mineral group to which plagioclase belongs.

Synonyms

• None commonly used: As a specific mineralogical term, "plagioclase" is typically used without direct synonyms. In very general contexts, it might be referred to as a feldspar, but this is a broader category.

Related Phrases (Phrasal Verbs)

• Not applicable: "Plagioclase" is a technical noun and does not form phrasal verbs.

Related Idioms

• Not applicable: There are no common idioms using the word "plagioclase."

Học thuật

Noun

1. any of a series of triclinic feldspars that form rocks

Từ đồng nghĩa

• oligoclase