Lodestone

A lodestone is a block that can be used to alter the point where compasses lead.

From block loot
Lodestone requires a pickaxe to be mined, in which case it drops itself. If mined without a pickaxe, then the mining is slower and it drops nothing.

Breaking
Lodestone requires a pickaxe to be mined, in which case it drops itself. If mined without a pickaxe, then the mining is slower and it drops nothing.

Lodestone Compass
a compass on a lodestone changes the compass to point to the lodestone. In addition, the compass uses the enchant and potion glint. If a lodestone is broken, then the compass starts spinning, similarly to compasses in the End or the Nether. This works in all dimensions. A compass will start spinning if it is set to a lodestone in a different dimension.

Trivia

 * In reality, lodestone is a naturally magnetized piece of the mineral magnetite, which can attract iron. They themselves are naturally occurring magnets.

Issues
Leitstein Magnetyt 磁石 Магнетит