What is lodestone and what was it used for in ancient china?

Lodestone is a naturally magnetized piece of the mineral magnetite, known for its magnetic properties. In ancient China, it was primarily used as a compass for navigation, allowing travelers and sailors to determine direction more accurately. The Chinese utilized lodestone's magnetic properties to align their compasses, which played a crucial role in maritime exploration and trade. Additionally, it had cultural and philosophical significance, often associated with concepts of balance and harmony.