In the part of west flank of Lujiatuo minefield, the normal siltstone roof of coal seam 8 changed into coarse to medium-grained sandstone, and also had phenomenon of coal seam pinch-out.
吕家坨井田西翼部分区域八煤层顶板由正常的粉砂岩变为粗中砂岩，并有煤层变薄现象。
2
Coarse-grained mustard has a grainy texture and a medium-hot fruity taste.
粗粒芥末有颗粒状纹理，并有中部热带水果的味道。
3
Microscopically the ores are mediumgrained to amorphous.