因开采时压成球状而得名。由高岭石构成并混有一定数量的石英、云母及有机质等杂质的一种可塑黏土。有时也含少量黄铁矿、白铁矿、菱铁矿等杂质，故陶瓷坯体中用量不宜过多。因其可塑性较好，常用于改善坯料的成型性能。
有人曾经怀疑他极端的握拍方式以及强劲有力的上旋球等适合土场作战的技术是否能在其他赛场上所向无敌。
Some doubted whether his extreme grip and massive topspin game which is made for clay could shine on other surfaces.
法网是唯一不采用录像技术的大满贯赛事，因为裁判可以在土场上检查球印。
The French Open is the only major event that doesn't use the video technology because officials can check ball marks left on the clay surface.
需要明亮的光泽，则需要用钢丝球或者湿的砂纸磨，之后用硅藻土抛光轮抛光。
For a bright glossy surface on your anodized part, steel wool or wet sand it and then polish it with a buffing wheel using tripoli compound.
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