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overview›catalogue›AM-2014-02180-B

AM-2014-02180-B · Bornite, anomalous transport behaviourarchived

physical & structuralrev. 5
designationBornite, anomalous transport behaviour
chemical formulaCu₅FeS₄
classificationSulfide
crystal systemOrthorhombic
mohs hardness3
density (g/cm³)5.06
colourIridescent purple-bronze on fresh fracture
type localityDzhezkazgan, Karaganda region, Kazakhstan
raman spectroscopy532 nm · pass B
200400600800100012001400Raman shift (cm⁻¹)intensity (arb.)292322470
λ_excitation: 532 nm · acq. 3 × 10 s · grating 1800 g/mmfig. 1 · raman.am-2014-02180-b.svg

reported peaks (cm⁻¹): 292, 322, 470

notessubmitter remarks + registry

DC four-probe measurement on a polished section indicates a drop in resistance of approximately three orders of magnitude between 245 K and 240 K. The transition reproduces on warming and cooling with hysteresis of 1.2 K. No published phase transition for the stated composition matches the observed onset temperature. Two independent confirmation runs are pending. Submitter notes attached to the original packet have been redacted at submitter's request.

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.

timestampstagedetailop.
2014-08-04 08:00 UTCintakeweighed, dimensioned, photographed; container sealed and labelled with the accession identifierM.A.
2014-08-06 14:30 UTCpass Avisual inspection · density (Archimedes) · mass to ±0.01 gT.J.
2014-08-12 15:07 UTCpass BRaman acquisition; 3 peaks above prominence threshold
instrument: Renishaw inVia (785 nm)
ref. checked: COD entry 140550
T.J.
2014-08-14 09:18 UTCstoragere-bagged, label re-printed; placed in vault C, shelf 15, drawer 34M.A.
2016-08-13 14:04 UTCre-inspectionseal intact · label legible · no visible degradationL.K.
2018-08-13 09:58 UTCre-inspectionseal intact · label legible · no visible degradationL.K.
2020-08-12 08:34 UTCre-inspectionseal intact · label legible · no visible degradationL.K.
2022-08-12 14:30 UTCre-inspectionseal intact · label legible · no visible degradationL.K.

physical location: vault C · shelf 15 · drawer 34 · last documented inspection: 2022-08-12 14:30 UTC