AM-2013-10021-A · Magnetitearchived
physical & structuralrev. 3
| designation | Magnetite |
|---|---|
| chemical formula | Fe₃O₄ |
| classification | Oxide / Spinel group |
| crystal system | Cubic |
| mohs hardness | 5.5 – 6.5 |
| density (g/cm³) | 5.11 |
| colour | Black, metallic to submetallic |
| type locality | Daoping mine, Guangxi, China |
raman spectroscopy532 nm · pass A
reported peaks (cm⁻¹): 303, 540, 666
notessubmitter remarks + registry
Photographic record retained. Single-pass examination only; no follow-up planned.
chain of custody8 events · 5 seal-breaks
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. |
|---|---|---|---|
| 2013-10-02 16:59 UTC | intake | weighed, dimensioned, photographed; container sealed and labelled with the accession identifier | L.K. |
| 2013-10-04 12:50 UTC | pass A | visual inspection · density (Archimedes) · mass to ±0.01 g | T.J. |
| 2013-10-18 10:17 UTC | pass B | Raman acquisition; 3 peaks above prominence threshold instrument: Horiba LabRAM HR (532 nm) ref. checked: AMCSD #7377 | T.J. |
| 2013-10-21 15:46 UTC | storage | re-bagged, label re-printed; placed in vault D, shelf 26, drawer 14 | L.K. |
| 2015-10-21 10:55 UTC | re-inspection | seal intact · label legible · no visible degradation | T.J. |
| 2017-10-20 12:41 UTC | re-inspection | seal intact · label legible · no visible degradation | T.J. |
| 2019-10-20 16:43 UTC | re-inspection | seal intact · label legible · no visible degradation | T.J. |
| 2021-10-19 16:32 UTC | re-inspection | seal intact · label legible · no visible degradation | T.J. |
physical location: vault D · shelf 26 · drawer 14 · last documented inspection: 2021-10-19 16:32 UTC