AM-2022-10005-A · Topazarchived
physical & structuralrev. 4
| designation | Topaz |
|---|---|
| chemical formula | Al₂SiO₄(F,OH)₂ |
| classification | Nesosilicate |
| crystal system | Orthorhombic |
| mohs hardness | 8 |
| density (g/cm³) | 3.57 |
| colour | Sherry-brown |
| type locality | Toroku mine, Miyazaki, Japan |
raman spectroscopy532 nm · pass A
reported peaks (cm⁻¹): 266, 291, 932
notessubmitter remarks + registry
Standard topaz reference specimen. Supplied as a single piece on a small fragment of host matrix.
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. |
|---|---|---|---|
| 2022-03-26 16:31 UTC | intake | weighed, dimensioned, photographed; container sealed and labelled with the accession identifier | R.E. |
| 2022-03-31 15:09 UTC | pass A | visual inspection · density (Archimedes) · mass to ±0.01 g | P.S. |
| 2022-04-03 13:07 UTC | pass B | Raman acquisition; 3 peaks above prominence threshold instrument: Renishaw inVia (785 nm) ref. checked: AMCSD #2648 | P.S. |
| 2022-04-04 16:17 UTC | storage | re-bagged, label re-printed; placed in vault B, shelf 07, drawer 26 | R.E. |
| 2024-04-03 08:46 UTC | re-inspection | seal intact · label legible · no visible degradation | V.O. |
| 2026-04-03 10:34 UTC | re-inspection | seal intact · label legible · no visible degradation | V.O. |
physical location: vault B · shelf 07 · drawer 26 · last documented inspection: 2026-04-03 10:34 UTC