Color: black
Streak: black
Hardness: 5 1/2–6 1/2
Specific gravity: 5.2
Cleavage: none
Fracture: subconchoidal to uneven
Luster: metallic on freshly broken surfaces
Crystal form: none
Transparency: opaque
Forms in igneous rocks and in veins and replacement deposits. May be grainy. Highly magnetic.
For an explanation of the properties (in bold face), click here >>