Phyllite片岩
Phyllite is a metamorphic rock form intermediate between slate and schist. It consists of platy minerals that are larger than those in slate, but still too small to be clearly discernable to the naked eye. Similar in appearance to slate, it is distinguished from slate by a glossy sheen compared to the dull appearance of slate. It usually exhibits cleavage, but not with the regularity of slate. Its composition is mainly very fine crystals of muscovite or chlorite. 片岩是一种介于片岩和片麻岩之间的变质岩。它由片状矿物组成，这些矿物的尺寸比片岩大，但仍然太小，无法用肉眼清楚辨认。其外观与片岩相似，但与片岩不同之处在于其表面有光泽，而片岩则显得较为暗淡。它通常表现出片理，但不像片岩那样规则。其成分主要是细粒的云母或绿泥石。
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Index Reference Lutgens and Tarbuck Ch 7 索引 参考 Lutgens 和 Tarbuck 第7章 | ||||||||
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