Hornblende is a common rock-forming mineral found in many igneous and metamorphic rocks. It is not typically mined as a specific mineral, but it can be found in various locations around the world as an accessory mineral in other mining operations. Some notable locations where hornblende-bearing rocks are found include:

1. Canada: Hornblende is found in various regions of Canada, including the Canadian Shield and the Rocky Mountains. It is commonly associated with granitic rocks and metamorphic belts.

2. United States: Hornblende occurs in several parts of the United States, including the Sierra Nevada Mountains, the Appalachian Mountains, and the Adirondack Mountains. It is often found in granitic intrusions and metamorphic rocks.

3. Europe: Hornblende is present in many European countries, such as Norway, Sweden, Finland, and the Alps. It is commonly found in igneous and metamorphic rocks of the Precambrian and Paleozoic eras.

4. Africa: Hornblende-bearing rocks are found in various parts of Africa, including the African Shield and the East African Rift System. It is associated with granitic rocks, volcanic formations, and metamorphic terrains.

5. Asia: Hornblende occurs in several Asian countries, including India, China, and Japan. It is commonly found in granitic rocks and metamorphic belts, particularly in the Himalayas and the Tibetan Plateau.

These are just a few examples of locations where hornblende-bearing rocks are found. Hornblende is generally not mined as a primary resource, but it may be encountered as an accessory mineral during mining operations for other commodities such as granite, marble, or gemstones.