Concept explainers
Name two mica minerals that can give a metamorphic rock its foliation.
The two mica minerals that can give a metamorphic rock its foliation.
Answer to Problem 11TE
The two mica minerals that give a metamorphic rock its foliation are slate and schist.
Explanation of Solution
Foliation is a layered appearance that occurs when rocks are under high pressure. Then under this pressure, the minerals readjust into parallel planes. The minerals having this kind of sheet structure grow in such a way that the sheets are at right angles to the direction of maximum force.
The rock, thus formed, has parallel flakes of mica, which is known as foliated rock. Slate is a foliated metamorphic rock that is made up of very tiny particles and mica flakes. Schist is another foliated rock, which is very shiny. The mica flakes in schist are larger.
Conclusion:
Therefore, the two mica minerals that give a metamorphic rock its foliation are slate and schist.
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