Multi-mineral sand particles (MSPs), commonly found in upland soils, can change the erosion properties, structure, moisture level, porosity, and permeability of soil; however, their effects are generally neglected in previous studies. In this study, we explored the morphology using scanning electron microscopy (SEM), particle size distribution (PSD), aggregation state, and mineralogy of soils derived from two types of clay rocks containing MSPs: shale and mudstone. The results showed that: (1) small lamellate bodies formed granules and blocks in a face-to-face or side-to-side manner and that the aggregation particles ranged from several to tens of microns in diameter, which increased gradually in a downslope direction; (2) the sand content in shale- and mudstone-derived soils decreased from 41.0% and 31.3%, respectively, on the summit to 19.6% and 18.4%, respectively, on the toeslope, whereas their clay content increased from 23.3% and 20.2% to 45.0% and 38.9%, respectively; (3) regarding the aggregation states of soil particles, the content of 0.25–2 mm MSPs in the shale- and mudstone-derived soils decreased from 62.9% and 45.2%, respectively, on the summit to 7.1% and 1.4%, respectively, on the toeslope, with averages of 42.3% and 20.8%, respectively. The content of 0.25–2 mm aggregates in the shale- and mudstone-derived soils increased from 9.1% and 6.2%, respectively, on the summit to 44.4% and 21.1%, respectively, on the toeslope, with averages of 21.5% and 14.2%, respectively; and (4) the mineralogy of the clay rock-derived soils and MSPs was generally dominated by illite, montmorillonite, vermiculite and calcite, which was similar to the mineralogy of the parent rocks. Therefore, a large amount of MSPs was found in clay rock-derived soils whose particle characteristics were determined by the environment of diagenesis and the physical weathering of pedogenesis.

多矿物砂粒（MSP）通常在陆地土壤中发现，可以改变土壤的侵蚀特性，结构，水分含量，孔隙度和渗透性；但是，它们的作用在以前的研究中通常被忽略。在这项研究中，我们使用扫描电子显微镜（SEM），颗粒大小分布（PSD），聚集态和由两种含MSP的黏土岩（页岩和泥岩）衍生的土壤的矿物学研究了形态。结果表明：（1）小片状体以面对面或并排的方式形成颗粒和块状，并且聚集颗粒的直径范围从几微米到几十微米不等，并在下坡时逐渐增加方向; （2）来自页岩和泥岩的土壤中的含沙量分别从山顶处的41.0％和31.3％降至19。坡度分别为6％和18.4％，而它们的粘土含量分别从23.3％和20.2％增加到45.0％和38.9％；（3）关于土壤颗粒的聚集状态，源自页岩和泥岩的土壤中0.25-2 mm MSPs的含量分别从峰顶的62.9％和45.2％分别降至7.1％和1.4％，在坡道上，平均分别为42.3％和20.8％。页岩和泥岩来源的土壤中0.25-2 mm团聚体的含量分别从山顶的9.1％和6.2％增加到坡度的44.4％和21.1％，平均分别为21.5％和14.2 ％， 分别; （4）粘土岩和MSP的矿物学特征通常以伊利石，蒙脱石，mor石和方解石为主，这与母岩的矿物学特征相似。