grayish black mudstone 灰黑色泥岩
He took off his glasses, this reporter noticed, this lens grayish black, wear to the feeling, more than sunglasses black.
他摘下眼镜，这时记者才留意到，这种眼镜的镜片呈灰黑色，戴上去的感觉，比墨镜更黑。
The Upper Triassic Series in the Zixing-Rucheng coalfield in southeastern Hunan is a set of grayish black sandy mudstone, fine sandstone, medium coarse sandstone and coal seams combination.
湘东南地区资汝煤田上三叠统为一套灰黑色砂质泥岩、细砂岩、中粗粒砂岩以及煤层等沉积组合，具有砂泥薄互层层理、斜波状层理、水平层理及大型交错层理等沉积结构。
The colors of classics, history, philosophy and belles-lettres were selected according to spring, summer, autumn and winter seasons, which were green, red, white or light blue and grayish black.
经、史、子、集四部颜色依春、夏、秋、冬四季而定，分别是绿色、红色、白色（或浅蓝色）、灰黑色。
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