Definition

1. Noun:
   • A mineral: A grey or greenish-blue mineral composed of aluminum silicate in crystalline form. It occurs in metamorphic rock and is used as a refractory material due to its resistance to high temperatures.

Usage Examples

• Noun:
  • The geologist identified the blue crystal as cyanite.
  • Cyanite is often found in association with other minerals in schist and gneiss.
  • Due to its heat-resistant properties, cyanite is valuable for manufacturing refractory products.

Advanced Usage

• In mineralogy: Cyanite is notable for its distinctive property of having variable hardness depending on the direction in which it is scratched (a characteristic called anisotropism or differential hardness).
  • Under examination, the cyanite crystal displayed its typical anisotropic hardness.

Variants and Related Words

• Kyanite: An alternative spelling for the same mineral.
  • Kyanite is the more common spelling in some geological texts.

Synonyms

• Disthene: A synonym for cyanite, also referring to the same aluminum silicate mineral, named for its two ("di-") different ("sthene" meaning strength) hardnesses.
  • The sample was confirmed to be disthene.

Related Terms

• Aluminum Silicate: The chemical compound (Al₂SiO₅) that constitutes cyanite.
• Refractory: A type of material, like cyanite, that is resistant to decomposition by heat and used in high-temperature applications.
• Metamorphic Rock: The type of rock, such as schist or gneiss, in which cyanite commonly forms.

Noun

1. a grey or greenish-blue mineral consisting of aluminum silicate in crystalline form; occurs in metaphoric rock, used as a refractory