Example Sentences

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These index minerals also provide important clues to a rock’s sedimentary protolith and the metamorphic conditions that created it.

From Textbooks • Jan. 1, 2017

Chlorite, muscovite, biotite, garnet, and staurolite are index minerals representing a respective sequence of low-to-high grade rock.

From Textbooks • Jan. 1, 2017

Geologists use index minerals that form at certain temperatures and pressures to identify metamorphic grade.

From Textbooks • Jan. 1, 2017

As with all metamorphic rock, the parent rock texture and chemistry are major factors in determining the final outcome of the metamorphic process, including what index minerals are present.

From Textbooks • Jan. 1, 2017

Shock metamorphism can also produce index minerals, though they are typically only found via microscopic analysis.

From Textbooks • Jan. 1, 2017