A spotted, shimmering appearance seen on the surface of some calcareous sandstones, caused by the reflection of light from coarse mineral cement crystals which enclose detrital quartz grains.
科学参考收录了60776条科技类词条，基本涵盖了常见科技类参考文献及英语词汇的翻译，是科学学习和研究的有利工具。