Physical properties
Habit: octahedral crystals crystalline, fine, encrustations, granular.
Color: white
or pinkish white.
Luster: metallic.
Diaphaneity: opaque.
Streak: grayish black.
Cleavage: {001} imperfect.
Fracture: uneven to subconchoidal.
Other: fuse on
the charcoal giving a magnetic globule of Co3O4. Soluble in hot concentrated HNO3
giving sulfur.
Occurrence: hydrothermal veins and with other sulfidic Co and Ni ores.
