Magnesite is not found in a single country. It is a mineral found in many countries around the world. Some of the major producers of magnesite include:

* China: The largest producer of magnesite globally.

* Austria: Known for high-quality magnesite deposits.

* Brazil: A significant producer of magnesite.

* Russia: Holds substantial magnesite reserves.

* India: A major producer and exporter of magnesite.

* Turkey: A notable magnesite producer.

* Greece: Has significant magnesite deposits.

* United States: Produces magnesite, though in smaller quantities compared to others.

It's important to note that this is not an exhaustive list, and magnesite can be found in various other countries as well.