千枚岩是一种浅变质的岩石，是泥质、粉沙质或中酸性凝灰岩等岩石经过区域变质作用而形成的，一般颜色较浅，为黄色、绿色、褐色或灰色，经过变质作用后，原岩中的物质也大部分重结晶，生成石英、绢云母、绿泥石等。

千枚岩的分类命名一般根据其颜色和成分，如黄色绢云母千枚岩；灰绿色泥石千枚岩等。

维基共享资源中相关的多媒体资源：千枚岩

Phyllite is a type of foliated metamorphic rock created from slate that is further metamorphosed so that very fine grained white mica achieves a preferred orientation. It is primarily composed of quartz, sericite mica, and chlorite.

Phyllite has fine-grained mica flakes in a preferred orientation, whereas slate has extremely fine clay flakes that achieve a preferred orientation, and schist has large flakes in a preferred orientation. Among foliated metamorphic rocks, it represents a gradation in the degree of metamorphism between slate and schist.