|Mineral class||Silicates : Inosilicates : Hornblende group.|
|Habitus||Prismatic crystals, often with hexagonal cross section and twinning. Also in massive, fibrous, bladed, columnar, and granular aggregates.|
|Cleavage||Perfect in two directions along the crystal with an angle of 60 or 120 degrees between cleavages. Fracture uneven.|
|Color||Black, green or greenish brown.|
|Streak||White or gray.|
|Luster||Vitreous, translucent to opaque.|
|Occurance||In igneous rocks. Also in metamorphic rocks as amphibolite and schist.|
|Notes|| Fuses with difficulty.|
Insoluble in acids.
|Locations|| A very common mineral in Sweden.|
| To silicate index.
|| Mineral group index.
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