AM-2022-10011-A · Chalcedonyarchived
physical & structuralrev. 1
| designation | Chalcedony |
|---|---|
| chemical formula | SiO₂ |
| classification | Tectosilicate / cryptocrystalline quartz |
| crystal system | Trigonal |
| mohs hardness | 6.5 – 7 |
| density (g/cm³) | 2.59 |
| colour | Banded grey |
| type locality | Panasqueira, Castelo Branco, Portugal |
raman spectroscopy532 nm · pass A
reported peaks (cm⁻¹): 128, 204, 463
notessubmitter remarks + registry
Specimen accompanied by a single typewritten card listing the locality and the year of collection. No further provenance information.
chain of custody6 events · 3 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. |
|---|---|---|---|
| 2022-06-17 11:55 UTC | intake | weighed, dimensioned, photographed; container sealed and labelled with the accession identifier | C.B. |
| 2022-06-18 09:13 UTC | pass A | visual inspection · density (Archimedes) · mass to ±0.01 g | N.P. |
| 2022-06-20 14:56 UTC | pass B | Raman acquisition; 3 peaks above prominence threshold instrument: Renishaw inVia (785 nm) ref. checked: AMCSD #7039 | N.P. |
| 2022-06-23 16:12 UTC | storage | re-bagged, label re-printed; placed in vault A, shelf 13, drawer 01 | C.B. |
| 2024-06-22 10:12 UTC | re-inspection | seal intact · label legible · no visible degradation | L.K. |
| 2026-06-22 14:52 UTC | re-inspection | seal intact · label legible · no visible degradation | L.K. |
physical location: vault A · shelf 13 · drawer 01 · last documented inspection: 2026-06-22 14:52 UTC