| Other names: | Hornblende is one of the Amphiboles (another Amphibole is Actinolite) |
| Mineral class: | Inosilicate |
| Composition: | (Ca, Na)2(Mg, Fe, Al)5(Al, Si)8O22(OH)2 |
| Hardness: | 5 - 6 |
| Luster: | Vitreous |
| Color: | Dark green, Black |
| Cleavage: | Prismatic cleavage, 120 degrees |
| Crystal form: | Monoclinic |
| Environment: | Found in metamorphic rocks and in mafic and ultramafic igneous rocks. |