AM-2017-03404-C · Scheelite, metastable spectral statearchived
| designation | Scheelite, metastable spectral state |
|---|---|
| chemical formula | CaWO₄ |
| classification | Tungstate |
| crystal system | Tetragonal |
| mohs hardness | 4.5 – 5 |
| density (g/cm³) | 5.95 |
| colour | Pale yellow, strongly fluorescent |
| type locality | Yaogangxian mine, Hunan, China |
reported peaks (cm⁻¹): 336, 412, 797, 911
Raman peaks at 911 cm⁻¹ show coherent drift of approximately ±0.4 cm⁻¹ over a six-hour acquisition window, well outside thermal expansion bounds for the cited environmental log. Drift is reversible on darkening of the specimen and reproduces across illumination cycles. Photoluminescence decay deviates from a single-exponential model. The specimen is otherwise indistinguishable from reference scheelite within current measurement precision.
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. |
|---|---|---|---|
| 2017-09-30 15:32 UTC | intake | weighed, dimensioned, photographed; container sealed and labelled with the accession identifier | L.K. |
| 2017-10-05 11:47 UTC | pass A | visual inspection · density (Archimedes) · mass to ±0.01 g | L.K. |
| 2017-10-17 16:26 UTC | pass B | Raman acquisition; 4 peaks above prominence threshold instrument: Renishaw inVia (532 nm, low-power head) ref. checked: ICDD card 04-4741 | L.K. |
| 2017-12-16 16:57 UTC | pass C | x-ray diffraction; powder mount; phase identification against the reference library instrument: Rigaku MiniFlex 600 (Cu Kα) ref. checked: RRUFF R05009 | L.K. |
| 2017-12-18 08:29 UTC | storage | re-bagged, label re-printed; placed in vault B, shelf 15, drawer 30 | L.K. |
| 2019-12-18 15:16 UTC | re-inspection | seal intact · label legible · no visible degradation | P.S. |
| 2021-12-17 14:35 UTC | re-inspection | seal intact · label legible · no visible degradation | P.S. |
| 2023-12-17 16:12 UTC | re-inspection | seal intact · label legible · no visible degradation | P.S. |
| 2025-12-16 15:50 UTC | re-inspection | seal intact · label legible · no visible degradation | P.S. |
physical location: vault B · shelf 15 · drawer 30 · last documented inspection: 2025-12-16 15:50 UTC
The following corrections have been issued for this record since accession. Original values are retained here for citation purposes; the canonical metadata above reflects the most recent correction.
| id | issued | field | was | now |
|---|---|---|---|---|
| ERR-2024-0002 | 2024-11-07 | density | 3.5 | 3.49–3.55 |