In sandstone grains range between 0.015-2 millimeters. Shale is composed of tightly packed clay and mud particles with grain size less than 0.005 millimeters.是什么意思_In sandstone grains range between 0.015-2 millimeters. Shale is composed of tightly packed clay and mud particles with grain size less than 0.005 millimeters.在线翻译_英语_读音_用法_例句