It has been found that a lot of gypsum and zinc bearing siderite occur on the surface of Xitieshan deposit and near ore country rocks of the upper part of the ore body.
锡铁山矿床地表及上部中段的近矿围岩中发育大量的石膏和含锌菱铁矿，长期以来主要作为喷流沉积或后期改造的产物。
The primary corundum deposit in eastern Hebei is near the ground surface. The corundum is megacrysts, pink or dark red color, semi-transparence to opaque.
冀东某地原生刚玉矿床具有埋藏浅，刚玉个体大、微红至暗红色、半透明至不透明等特点，经人工改善可生产低档红宝石。
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