AM-2024-10004-A · Tourmaline (schorl)unverified
The classification below is preliminary. Spectroscopic confirmation is incomplete; values shown reflect the most recent analytical pass and may be revised without notice.
physical & structuralrev. 4
| 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) | 3.11 |
| colour | Black with greenish termination |
| type locality | Ratnapura, Sabaragamuwa, Sri Lanka |
raman spectroscopy532 nm · pass A
reported peaks (cm⁻¹): 220, 364, 1061
notessubmitter remarks + registry
Photographic record retained. Specimen temperature held at lab ambient throughout intake.
chain of custody5 events · 2 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. |
|---|---|---|---|
| 2024-05-23 15:39 UTC | intake | weighed, dimensioned, photographed; container sealed and labelled with the accession identifier | T.J. |
| 2024-05-26 15:58 UTC | pass A | visual inspection · density (Archimedes) · mass to ±0.01 g | P.S. |
| 2024-06-10 10:47 UTC | pass B | Raman acquisition; 3 peaks above prominence threshold instrument: Renishaw inVia (532 nm, low-power head) ref. checked: ICDD card 04-3133 | P.S. |
| 2024-06-12 10:07 UTC | storage | re-bagged, label re-printed; placed in vault D, shelf 08, drawer 30 | T.J. |
| 2026-06-12 16:39 UTC | re-inspection | seal intact · label legible · no visible degradation | P.S. |
physical location: vault D · shelf 08 · drawer 30 · last documented inspection: 2026-06-12 16:39 UTC