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。
Pores are closely correlated with sandstone fabric, and are more easily generated in medium grained sandstone where feldspar content is high(>37%) and cement content is low(carbonate<50%).
孔隙与砂岩组构密切相关，孔隙更容易产生于长石含量高（>37% ）、且胶结物含量低（碳酸盐<5 % ）的中粒砂岩中。
The ore-hosting Yaojia Formation is composed of a set of braided stream medium-fine grained sediments.
姚家组为一套中细粒辫状河流沉积。
Statistical results show that medium and fine-grained sandstones are the most favorable rock types for uranium mineralization.
统计结果表明，中、细粒砂岩是铀矿化最有利的岩石类型。
Microscopically the ores are medium grained to amorphous.
显微镜下，矿石为中粒至非晶质。
Acid intrusive rocks are composed mainly of medium - and coarse-grained monzogranite. They contain a small number of xenoliths, whose features are the same as intermediate-acid intrusive rocks.
酸性侵入岩以中粗粒二长花岗岩为主，岩石中含有少量包体，包体的特征与中酸性侵入岩中的相同。
Medium adhesion: suitable for coarse-grained stainless steel plate, PVC profile, polyester plate, fine-grained ground plate etc.
中粘要求：适用于不锈钢粗纹磨沙板、雪花板、铝塑板（细纹）、塑钢、铝型材和聚脂板材等产品。
Medium adhesion: suitable for coarse-grained stainless steel plate, PVC profile, polyester plate, fine-grained ground plate etc.
中粘要求：适用于不锈钢粗纹磨沙板、雪花板、铝塑板（细纹）、塑钢、铝型材和聚脂板材等产品。
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