AM-2017-10012-A · Tourmaline (schorl)archived
physical & structuralrev. 1
| designation | Tourmaline (schorl) |
|---|---|
| chemical formula | NaFe²⁺₃Al₆(BO₃)₃Si₆O₁₈(OH)₄ |
| classification | Cyclosilicate / Tourmaline group |
| crystal system | Trigonal |
| mohs hardness | 7 – 7.5 |
| density (g/cm³) | 3.14 |
| colour | Black |
| type locality | Shigar valley, Gilgit-Baltistan, Pakistan |
raman spectroscopy532 nm · pass A
reported peaks (cm⁻¹): 364, 709, 1064
notessubmitter remarks + registry
Standard tourmaline (schorl) reference specimen. Supplied as a single piece on a small fragment of host matrix.
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. |
|---|---|---|---|
| 2017-05-06 14:32 UTC | intake | weighed, dimensioned, photographed; container sealed and labelled with the accession identifier | V.O. |
| 2017-05-07 14:09 UTC | pass A | visual inspection · density (Archimedes) · mass to ±0.01 g | C.B. |
| 2017-05-14 12:33 UTC | pass B | Raman acquisition; 3 peaks above prominence threshold instrument: Horiba LabRAM HR (532 nm) ref. checked: AMCSD #4800 | C.B. |
| 2017-05-15 08:43 UTC | storage | re-bagged, label re-printed; placed in vault B, shelf 17, drawer 24 | V.O. |
| 2019-05-15 15:45 UTC | re-inspection | seal intact · label legible · no visible degradation | T.J. |
| 2021-05-14 10:27 UTC | re-inspection | seal intact · label legible · no visible degradation | T.J. |
| 2023-05-14 08:59 UTC | re-inspection | seal intact · label legible · no visible degradation | T.J. |
| 2025-05-13 14:48 UTC | re-inspection | seal intact · label legible · no visible degradation | T.J. |
physical location: vault B · shelf 17 · drawer 24 · last documented inspection: 2025-05-13 14:48 UTC