Hornblende is a group of dark-colored amphibole minerals that are found in many types of igneous and metamorphic rocks. It is a rock-forming mineral that is an important constituent in acidic and intermediate igneous rocks such as granite, diorite, syenite, andesite, and rhyolite. It is also found in metamorphic rocks such as gneiss and schist. Hornblende is used for various purposes, including:

• Construction: Hornblende is a common dimension stone used in construction, paving, and facing of buildings due to its attractive textures, dark color, hardness, and polishability.

• Decoration: Hornblende is cut and polished for household decoration like tile and countertops. Larger quantities are used for decoration on buildings.

• Statues: Hornblende is sometimes carved into statues.

• Geological studies: Hornblende has been used to estimate the depth of crystallization of plutonic rocks. It has also been used to study the changes in mineral composition with the changing environment, such as changes in pressure and/or temperature.

In summary, hornblende is a mineral that is commonly found in igneous and metamorphic rocks and is used for construction, decoration, statues, and geological studies.