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Gneiss
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. It is often foliated (composed of layers of sheet-like planar structures). The foliations are characterized by alternating darker and lighter colored bands, called "gneissic banding". ==Etymology== The word ''gneiss'' comes from the Middle High German verb (to spark; so called because the rock glitters). It has occurred in English since at least 1757.〔Harper, ''Online Etym. Dict.'', ("gneiss" )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Gneiss」の詳細全文を読む
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