AM-2014-02180-B · Bornite, anomalous transport behaviourarchived
physical & structuralrev. 5
| designation | Bornite, anomalous transport behaviour |
|---|---|
| chemical formula | Cu₅FeS₄ |
| classification | Sulfide |
| crystal system | Orthorhombic |
| mohs hardness | 3 |
| density (g/cm³) | 5.06 |
| colour | Iridescent purple-bronze on fresh fracture |
| type locality | Dzhezkazgan, Karaganda region, Kazakhstan |
raman spectroscopy532 nm · pass B
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.