《太平广记·卷一百一十八·报应十》
有一天晚上睡在船上，忽然见岸上的沙滩里发出一尺多高的光焰，就挖发光的地方，挖出来几斤黄金。第二天，到都市去买，市上的人说： 这就是所说的紫磨金。
后鬻薪于石头，穷苦至甚，尝暮宿于江上。忽见沙中光焰高尺余，就掘之，得黄金数斤。明日，赍诣都市货之。市人云： 此所谓紫磨金也。 
One night, he slept on the boat and suddenly saw a light several feet high shining from the sandy beach on the shore. He dug at the spot where the light was coming from and dug out several pounds of gold. The next day, he went to the city to sell it. The people in the market said, "This is what is known as purple grinding gold."