AM-2026-00015-A · Tourmaline, var. schorlarchived
physical & structuralrev. 1
| designation | Tourmaline, var. schorl |
|---|---|
| chemical formula | NaFe₃Al₆(BO₃)₃Si₆O₁₈(OH)₄ |
| classification | Cyclosilicate / Tourmaline group |
| crystal system | Trigonal |
| mohs hardness | 7 – 7.5 |
| density (g/cm³) | 3.18 – 3.22 |
| colour | Black |
| type locality | Tyrnyauz, Kabardino-Balkaria, Russia |
raman spectroscopy532 nm · pass A
reported peaks (cm⁻¹): 221, 368, 706
notessubmitter remarks + registry
Prismatic crystals of black colouration with characteristic trigonal striations on prism faces. Submitted as part of a small consignment of Tyrnyauz material; locality recorded to district level only.
chain of custody4 events · 1 seal-break
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. |
|---|---|---|---|
| 2026-08-08 14:08 UTC | intake | weighed, dimensioned, photographed; container sealed and labelled with the accession identifier | P.S. |
| 2026-08-13 08:45 UTC | pass A | visual inspection · density (Archimedes) · mass to ±0.01 g | N.P. |
| 2026-08-21 09:10 UTC | pass B | Raman acquisition; 3 peaks above prominence threshold instrument: Renishaw inVia (532 nm) ref. checked: AMCSD #5206 | N.P. |
| 2026-08-22 13:08 UTC | storage | re-bagged, label re-printed; placed in vault B, shelf 13, drawer 21 | P.S. |
physical location: vault B · shelf 13 · drawer 21 · last documented inspection: 2026-08-22 13:08 UTC