Chemical Properties
| Definition | A natural iron sulfide. Frequently has a deficiency in iron. May contain small amounts of nickel, cobalt, manganese, and copper. |
| Appearance | Brownish-bronze color, black streak, metallic luster. Slightly magnetic. Hardness 4. |
| density | 4.63 g/cm3 |
| form | Grains |
| color | Gray |
| Uses |