plagioclase
/'pleidʤioukleis/
Definition
- 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."
Noun
-
any of a series of triclinic feldspars that form rocks
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