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Geosciences LibreTexts

13.3: Activity 13B- Interpreting Metamorphic Index Minerals

  • Page ID
    14572
  • Use the figure below to answer the questions in this section.

    13.23.png
    Figure 13.23: Different index minerals form depending on the amount heat and pressure the protolith undergoes.

    1. The flat, platy minerals common in foliated metamorphic rocks are:
      1. Amphibole
      2. Calcite
      3. Quartz
      4. Mica
      5. Serpentine
    2. Which of the following minerals would likely be found in a high-grade metamorphic rock?
      1. Chlorite
      2. Muscovite
      3. Biotite
      4. Kyanite
    3. Which of the following minerals would likely be found in a low-grade metamorphic rock?
      1. Chlorite
      2. Biotite
      3. Garnet
      4. Sillimanite
    4. Which mineral is unstable in the staurolite zone?
      1. Chlorite
      2. Muscovite
      3. Biotite
      4. Garnet
    5. Which index minerals will not be found together in the same rock?
      1. chlorite and garnet
      2. chlorite and kyanite
      3. biotite and staurolite
      4. biotite and muscovite

    WHY NOT?

    Attributions

    • Figure 13.23: “Index Minerals” (CC-BY 4.0; Chloe Branciforte, own work)