《太平广记·卷十三·神仙十三》
老虎就跑掉了。介象进山后，看见山谷中有很多鸡蛋大的紫色石头光彩夺目，就拣了两枚，因为山谷太深不能再往前走，就回来了。
虎乃去，象入山，谷上有石子，紫色，光绿甚好，大如鸡子，不可称数。
The tiger then ran away. After entering the mountain, Jie Xiang saw many glowing purple stones as large as eggs in the valley, so he picked two of them because the valley was too deep to pass through, so he returned.