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Chapter 7: Problem 8

Rearrange the following minerals in order of increasing metamorphic grade: biotite, garnet, sillimanite, chlorite.

Short Answer

Expert verified
The rearranged mineral order representing increasing metamorphic grade is: chlorite, biotite, garnet, sillimanite.

Step by step solution

01

Understanding Metamorphic Grade

Metamorphic grade refers to the level of heat and pressure experienced by a rock during metamorphism. As the grade increases, the minerals present in the rock change due to the increased temperature and pressure. Typically, mineral assemblages found in rocks of various metamorphic grades are used as indicators to determine the metamorphic grade of the rock.
02

Recognizing Index Minerals

Index minerals are minerals that are indicative of a specific metamorphic grade or metamorphic facies. The following minerals are commonly used as index minerals to identify different metamorphic grades (from lowest to highest grade): chlorite, biotite, garnet, staurolite, kyanite, and sillimanite.
03

Rearrange the Given Minerals

Now, we can easily rearrange the given minerals in the order of increasing metamorphic grade by referencing the list of index minerals. The order is as follows: 1. Chlorite (lowest grade) 2. Biotite 3. Garnet 4. Sillimanite (highest grade) So, the rearranged mineral order representing increasing metamorphic grade is: chlorite, biotite, garnet, sillimanite.

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