Pyrrhotite
| Formula | Fe1−xS (x = 0 to 0.17) |
| Origin | Nikolaevskiy Mine, Dal´negorsk (Russland) |
| Description | large golden brown pyrrothite crystal on matrix overgrown with quartz crystals |
| Classification (Lapis) | Sulfides |
| Crystal System | monoclinic |
| Hardness | 3,5 – 4,5 |
| Colour | Bronze-yellow to pinchbeck-brown; tarnishes quickly, rarely to iridescence |
| Streak | Dark grayish black |
| Luminescence | none observed |
| Lustre | Metallic |
| Transparency (Opacity) | Opaque |
| Cleavage | Distinct |
| Fracture | Uneven to Conchoidal |
| Magnetism | negative |
| Geological Setting | Mainly in mafic igneous rocks, typically as magmatic segregations; also in pegmatites, and in high-temperature hydrothermal and replacement veins, and in sedimentary and metamorphic rocks; in iron meteorites |
| Specific Gravity | 4,69 g/cm3 |
crystal model
#© Mark Holtkamp
