rubbing stone meaning in Chinese

磨刀石
磨光石
磨面石
磨石

Rubbing stones together produces sparks to start a fire
用石头相擦可产生火花用来引火
Jasper with light and dark brown markings was referred to as " egyptian marble " . various native american tribes used jasper as a rubbing stone and some called it " the rain bringer " . black jasper is credited to bring good luck to the wearer in a fight , whether it be a mental , political , legal , or other type of fight
属于吸收性的能量，能消除脑部的压力负担，舒缓压力，放送身心机能唤醒活泼的行动力，还予一个清明的思想空间，它能促进一个人的思考推理及逻辑的能力，消除遐想不正当的念头及欲望。