Hardness: 6 - 7
Density: 3.4 - 3.5
Habit: Aggregate of small grains, striated faces, small but visible crystals
Colours: Greeny, yellow-green, black
| ||Crystal System: Monoclinic|
Reaction with HCl: None
Identification in hand sample:
Slight colour difference between this mineral and olivine, but only under magnification (where details in the crystals can be seen). Also indicitive is the presence of a cleavage plane.
Common accessory mineral in many regional and contact metamorphed rocks, particularly in more iron-rich rocks.
Industrial / ecomonic uses: