Crystal system:
Isometric.
Crystal habit
Wiry, branching
masses or grains, or, rarely,
cubic crystals. Wires can
form, coils like rams' horns.
Colour: Silver-white but
tarnishing quicklv to black.
Lustre: Metallic.
Streak: Silver-white.
Hardness: 2.5-3.
Cleavage: None.
Fracture: Hackly.
Specific gravity 10-12.
Other characteristics Soft
enough to stretch into wires
and hammer into shapes.
Notable locations
Kongsberg, Norway; Sankt
Andreasberg (Harz Mts).
Freiburg (Saxony). Germany;
Jachymov, Czech Republic;
Chihuahua, Mexico; Great
Bear Lake, Northwest
Territories; Cobalt. Ontario;
Michigan; Creede, Colorado.
4.