amphibole
/ˈæmfɪboʊl/
noun
- A group of common rock-forming minerals that are usually dark in color and have a long, thin crystal shape.
- Some types of amphibole, like asbestos, can be dangerous if inhaled.
- The geologist identified the dark mineral in the sample as amphibole.
- Amphibole is often found in igneous and metamorphic rocks.