AM-2012-00833-A · Pyrrhotite, anomalous magnetic responsearchived
physical & structuralrev. 4
| designation | Pyrrhotite, anomalous magnetic response |
|---|---|
| chemical formula | Fe₁₋ₓS |
| classification | Sulfide / Pyrrhotite group |
| crystal system | Monoclinic |
| mohs hardness | 3.5 – 4.5 |
| density (g/cm³) | 4.61 |
| colour | Bronze yellow, tarnishing brown |
| type locality | Sudbury basin, Ontario, Canada |
raman spectroscopy532 nm · pass A
reported peaks (cm⁻¹): 218, 286, 339, 376
notessubmitter remarks + registry
Four-probe magnetometry indicates persistent magnetisation following thermal demagnetisation cycles to 400 K. Behaviour is inconsistent with the stoichiometric vacancy fraction reported by EDX. The demagnetisation curve is non-Arrhenius. Specimen has been re-tested at three independent facilities; results agree within experimental uncertainty. No mechanism has been advanced.