同心层 meaning in Chinese

concentric lamination
concentric layers

As a result , agate is often found as a round nodule , with concentric bands like the rings of a tree trunk
，内在有着如同树轮般同心层状的纹带。
No gemstone is more creatively striped by nature than agate , chalcedony quartz that forms in concentric layers in a wide variety of colours and textures
同心层状不规则纹带或缠丝构造的隐晶质块体石英