M E N U « Home | Browse Minerals | QuizzesMinerals by letter: All | K | G | O | A | H | T | P | C | Q | N | Z | S | E | W | M | B | F | D | L Minerals by class: Silicates | Halides | Carbonates | Sulfates | Oxides | Phosphates | Hydroxides | Native elements | Sulfides Silicate Subclasses: Nesosilicates | Pyroxenes | Amphiboles | Frameworks | Sorosilicates | Cyclosilicates | Phyllosilicates    « Back to mineral listing H O R N B L E N D E Click for expanded view HornblendeCa2(Mg,Fe)4Al(Si7Al)O22(OH,F)2 Class: Silicate Subclass: Amphibole Hardness: 5 - 6 Density: 3.3 - 3.4 Streak: White or gray Lustre: Vitreous Habit: Intergrown crystals, prismatic character of grains. Colours: Black    Crystal System: Monoclinic Cleavage: 2 at 56° and 124° Fracture: Uneven / conchoidal Magnetism: None Reaction with HCl: None Identification in hand sample: Prominent striations, prismatic crystals and angle on cleavages is distinguishing. Associations: Forms in igneous rocks, and in the metamorphic rock amphibolite. Industrial / ecomonic uses: Ornamental.    Inaccurate data? Better photos? .

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