Boron is found in nature primarily as borate minerals. Borate minerals are compounds that contain boron, oxygen, and one or more additional elements. The most common borate minerals include:

- Borax (sodium borate)

- Kernite (sodium borate hydrate)

- Ulexite (sodium calcium borate hydrate)

- Colemanite (calcium borate)

- Tourmaline (a complex borate mineral containing various elements)

These minerals are found in various locations worldwide, including:

* United States: The United States is the largest producer of boron in the world, with major borate deposits in California, Nevada, and Oregon.

* Turkey: Turkey has significant borate deposits and is a major exporter of borate minerals.

* Chile: Chile has substantial borate reserves and is another important producer of borate minerals.

* Argentina: Argentina also has significant borate deposits and is a notable producer of borate minerals.

* Russia: Russia has borate deposits and is a notable producer of borate minerals.

Boron can also be found in some plants, such as certain nuts, seeds, and fruits, and in seawater, but these sources are generally not commercially viable for boron extraction.