AM-2026-00003-A · Talcarchived
physical & structuralrev. 1
| designation | Talc |
|---|---|
| chemical formula | Mg₃Si₄O₁₀(OH)₂ |
| classification | Phyllosilicate |
| crystal system | Monoclinic |
| mohs hardness | 1 |
| density (g/cm³) | 2.58 – 2.83 |
| colour | Pale green to white |
| type locality | Madagascar (provenance unspecified) |
raman spectroscopy532 nm · pass A
reported peaks (cm⁻¹): 196, 361, 677
notessubmitter remarks + registry
Foliated masses with characteristic greasy lustre and pale green colouration. Submitted as part of a bulk consignment from Madagascar; provenance below country level not supplied.
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. |
|---|---|---|---|
| 2026-05-08 14:55 UTC | intake | weighed, dimensioned, photographed; container sealed and labelled with the accession identifier | T.J. |
| 2026-05-11 10:45 UTC | pass A | visual inspection · density (Archimedes) · mass to ±0.01 g | L.K. |
| 2026-05-20 14:27 UTC | pass B | Raman acquisition; 3 peaks above prominence threshold instrument: Horiba LabRAM HR (532 nm) ref. checked: AMCSD #2279 | L.K. |
| 2026-05-23 09:45 UTC | storage | re-bagged, label re-printed; placed in vault B, shelf 20, drawer 31 | T.J. |
physical location: vault B · shelf 20 · drawer 31 · last documented inspection: 2026-05-23 09:45 UTC