What is gneiss?

Q: What is gneiss?



A: Gneiss is a type of metamorphic rock.

Q: Where do the minerals in gneiss come from?



A: The minerals in gneiss may come from rocks which were originally either igneous or sedimentary.

Q: How are the minerals in gneiss formed?



A: They were heated and squeezed, and the minerals recrystallized.

Q: What is orthogneiss?



A: Orthogneiss is gneiss obtained from igneous rock (such as granite).

Q: What is paragneiss?



A: Paragneiss is gneiss obtained from sedimentary rock (such as sandstone).

Q: What is the texture of minerals in gneisses?



A: In gneisses, minerals tend to be foliated: layered and segregated into bands.

Q: What is the composition of a mica schist seam?



A: There are seams of quartz and of mica in a mica schist, very thin, but consisting essentially of one mineral.

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