AM-2026-00008-A · Cordieritearchived
physical & structuralrev. 1
| designation | Cordierite |
|---|---|
| chemical formula | (Mg,Fe)₂Al₄Si₅O₁₈ |
| classification | Cyclosilicate |
| crystal system | Orthorhombic |
| mohs hardness | 7 – 7.5 |
| density (g/cm³) | 2.61 |
| colour | Blue with strong pleochroism |
| type locality | Tsumeb, Otjikoto, Namibia |
raman spectroscopy532 nm · pass A
reported peaks (cm⁻¹): 263, 581, 971, 1182
notessubmitter remarks + registry
Equant prismatic fragment showing characteristic blue-violet pleochroism on rotation under polarised light. Submitted as part of a small consignment of Tsumeb material; locality recorded to mine level only.
chain of custody4 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. |
|---|---|---|---|
| 2026-06-10 14:01 UTC | intake | weighed, dimensioned, photographed; container sealed and labelled with the accession identifier | R.E. |
| 2026-06-11 11:45 UTC | pass A | visual inspection · density (Archimedes) · mass to ±0.01 g | P.S. |
| 2026-06-20 10:55 UTC | pass B | Raman acquisition; 4 peaks above prominence threshold instrument: Horiba LabRAM HR (532 nm) ref. checked: COD entry 171327 | P.S. |
| 2026-06-23 15:05 UTC | storage | re-bagged, label re-printed; placed in vault B, shelf 02, drawer 30 | R.E. |
physical location: vault B · shelf 02 · drawer 30 · last documented inspection: 2026-06-23 15:05 UTC