AM-2015-10001-A · Rhodochrositearchived
physical & structuralrev. 5
| designation | Rhodochrosite |
|---|---|
| chemical formula | MnCO₃ |
| classification | Carbonate / Calcite group |
| crystal system | Trigonal |
| mohs hardness | 3.5 – 4 |
| density (g/cm³) | 3.71 |
| colour | Banded pink and white |
| type locality | Bahia, Brazil |
raman spectroscopy532 nm · pass A
reported peaks (cm⁻¹): 185, 288, 722, 1085, 1719
notessubmitter remarks + registry
Standard rhodochrosite reference specimen. Supplied as a single piece on a small fragment of host matrix. Re-pass note (2026-10-18). Re-pass on 2026-10-18 reproduces previous measurements within experimental uncertainty; accompanying matrix re-described as a fragment of rhyodacitic host rather than the originally logged undifferentiated silicate.
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. |
|---|---|---|---|
| 2015-06-12 09:56 UTC | intake | weighed, dimensioned, photographed; container sealed and labelled with the accession identifier | M.A. |
| 2015-06-14 15:05 UTC | pass A | visual inspection · density (Archimedes) · mass to ±0.01 g | L.K. |
| 2015-06-17 11:02 UTC | pass B | Raman acquisition; 5 peaks above prominence threshold instrument: Horiba LabRAM HR (532 nm) ref. checked: ICDD card 04-4271 | L.K. |
| 2015-06-19 16:57 UTC | storage | re-bagged, label re-printed; placed in vault B, shelf 14, drawer 36 | M.A. |
| 2017-06-18 09:57 UTC | re-inspection | seal intact · label legible · no visible degradation | T.J. |
| 2019-06-18 13:33 UTC | re-inspection | seal intact · label legible · no visible degradation | T.J. |
| 2021-06-17 11:15 UTC | re-inspection | seal intact · label legible · no visible degradation | T.J. |
| 2023-06-17 15:19 UTC | re-inspection | seal intact · label legible · no visible degradation | T.J. |
physical location: vault B · shelf 14 · drawer 36 · last documented inspection: 2023-06-17 15:19 UTC