Mineral assemblages in sulfide ores; the system Cu-Fe-As-S

Towards a deeper understanding of the third millennium BC Iranian metallurgy: Use of synchrotron light for characterizing arsenic‐bearing minerals in metal objects from Espidej

“…The dominant As–S‐bearing minerals in the metal core are algodonite, bornite and arsenopyrite. Algodonite is only found at the base deposits of copper 65 . The high intensity of the peaks is obviously close to each other in the SR‐μXRD diffractogram; nevertheless, its intensity might had been overlapped under the algodonite peak intensity.…”

Thermodynamic Evaluation and Optimization of the As-Co, As-Fe and As-Fe-S Systems

“…Based on mineral occurrences reported in the literature, McKinstry [94] proposed a As-Fe-S ternary phase diagram without considering the phases FeAs and Fe 2 As. According to Clark [93], tie-lines change as function of deposition temperature and pressure, and since the proposed phase diagrams by McKinstry [94] is based on a series of isolated mineral occurrences, it may include assemblages that are not stable at any given temperature. Clark [61,93] investigated phase relations in the synthetic As-Fe-S ternary system and the measurements were performed with the presence of vapor.…”

“…Isothermal sections [61,93] Evacuated, sealed silica tubes experiments, XRD and optical examination: Determination of equilibrium phase relations at 873 K, and changes in assemblages between 673 K and 1023 K. [80] Quenching experiments, XRD, optical examination and pyrrhotite-indicator method: Determination of four-phase invariant reactions during solidifications and prediction of isothermal sections between 554 K and 1103 K. [94] Based on literature descriptions of natural assemblages: Proposition of a As-Fe-S phase diagram. [95] Sub-solidus recrystallization experiments, microprobe analysis and XRD: Determination of the composition and phase relations involving FeAsS.…”

Stereological methods applied to mineralogy, petrology, mineral deposits and ceramics

“…A semiquantitative application of intergrowth frequences or of mineral paragenesis was given by McKinstry in 1957 and1959. He compared the frequency of occurrence of known mineral associations in the systems Cu-Fe-S-0, Cu-As-S, Pb-As-S and Pb-Sb-S with the known phase diagrams and drew conclusions on possible and impossible tie lines.…”