index mineral meaning

  "index mineral" in a sentence
noun (geology)
  A mineral whose appearance marks a particular grade of metamorphism in progressive regional metamorphism

Examples

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  1. Staurolite is a common metamorphic intermediate-grade index mineral.
  2. Minerals that are characteristic for a certain metamorphic grade are called index minerals.
  3. Often they are named for the most characteristic index mineral of the zone.
  4. Many index minerals have complicated chemical compositions.
  5. Index minerals are used in geology to determine the degree of metamorphism a rock has experienced.

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