apatite

/'æpətait/
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apatite

A student examines a green apatite crystal in geology class.

Definition
  1. Noun:
    • A common complex mineral: Apatite is a naturally occurring mineral composed primarily of calcium phosphate combined with fluoride, chloride, or hydroxide. It is a primary source of phosphorus.
Usage
  • Apatite is a term used in geology, mineralogy, and chemistry. It refers to a specific group of phosphate minerals that share a common crystal structure but vary in their exact chemical composition (e.g., fluorapatite, chlorapatite, hydroxyapatite).
  • It is used to identify a mineral specimen or to discuss the geological occurrence and economic importance of phosphate ores.
Examples
  • Noun:
    • The geologist identified the green crystal as apatite.
    • Apatite is the main component of phosphate rock, which is mined for fertilizer production.
    • Tooth enamel contains a form of apatite called hydroxyapatite.
Advanced Usage
  • "Apatite group": Refers to the entire family of minerals with the general chemical formula Ca₅(PO₄)₃(F,Cl,OH).
    • Minerals in the apatite group are important in both igneous and sedimentary rocks.
  • Used in scientific contexts to discuss biomineralization (e.g., bones and teeth) and as an indicator mineral in geological exploration.
Variants and Related Words
  • Fluorapatite (n): The most common variety of apatite, where fluoride (F) is the dominant anion (Ca₅(PO₄)₃F).
  • Chlorapatite (n): A variety of apatite where chloride (Cl) is the dominant anion (Ca₅(PO₄)₃Cl).
  • Hydroxyapatite (n): A variety of apatite where hydroxide (OH) is the dominant anion (Ca₅(PO₄)₃OH); a key component of vertebrate bone and tooth enamel.
Synonyms
  • Phosphate mineral: A broader category of minerals containing the phosphate anion (PO₄³⁻), which includes apatite.
Related Phrases
  • Apatite fission track dating: A geological dating method that uses damage trails (fission tracks) within apatite crystals to determine the thermal history of rocks.
    • Apatite fission track dating helped determine when the mountain range was uplifted.
apatite

A student examines a green apatite crystal in geology class.

Noun
  1. a common complex mineral consisting of calcium fluoride phosphate or calcium chloride phosphate; a source of phosphorus

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