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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Gneiss is a common and widely distributed type of rock formed by high-grade regional metamorphic processes from pre-existing formations that were originally either igneous or sedimentary rocks. The etymology of the word gneiss is disputed. Some sources say it comes from the Middle High German verb gneist (to spark; so called because the rock glitters). It has occurred in English since at least 1757. Other sources claim the root to be an old Saxon mining term that seems to have meant decayed, rotten, or possibly worthless material.

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