AM-2012-00833-A · Pyrrhotite, anomalous magnetic responsearchived
| 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 |
reported peaks (cm⁻¹): 218, 286, 339, 376
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. Re-pass note (2026-09-27). Re-pass on 2026-09-27 reproduces previous magnetometry within experimental uncertainty; archival status retained.
Events recorded against this accession in the registry's printed custody book. Operator initials are anonymous. Storage codes follow the convention vault-shelf-drawer.
| timestamp | stage | detail | op. |
|---|---|---|---|
| 2012-05-23 14:32 UTC | intake | weighed, dimensioned, photographed; container sealed and labelled with the accession identifier | N.P. |
| 2012-05-26 09:15 UTC | pass A | visual inspection · density (Archimedes) · mass to ±0.01 g | S.W. |
| 2012-05-31 11:48 UTC | pass B | Raman acquisition; 4 peaks above prominence threshold instrument: Renishaw inVia (785 nm) ref. checked: ICDD card 04-1752 | S.W. |
| 2012-06-01 13:56 UTC | storage | re-bagged, label re-printed; placed in vault C, shelf 17, drawer 22 | N.P. |
| 2014-06-01 15:49 UTC | re-inspection | seal intact · label legible · no visible degradation | P.S. |
| 2016-05-31 08:21 UTC | re-inspection | seal intact · label legible · no visible degradation | P.S. |
| 2018-05-31 11:27 UTC | re-inspection | seal intact · label legible · no visible degradation | P.S. |
| 2020-05-30 13:47 UTC | re-inspection | seal intact · label legible · no visible degradation | P.S. |
physical location: vault C · shelf 17 · drawer 22 · last documented inspection: 2020-05-30 13:47 UTC