Bulk synthesis of stoichiometric/meteoritic troilite (FeS) by high‐temperature pyrite decomposition and pyrrhotite melting

Stoichiometric troilite (FeS) is a common phase in differentiated and undifferentiated meteorites. It the endmember of iron sulfide system. Troilite important for investigating shock metamorphism meteorites studying spectral properties space weathering planetary bodies. Thus, obtaining coarse-grained meteoritic quantities beneficial these fields. The previous synthesis was achieved by pyrite or pyrrhotite heating treatments chemical syntheses. However, most works lacked visual characterization step process final product, production large quantities, they were not readily advertised to scientists meteoritical research community. Here, we illustrate two-step heat treatment synthesize troilite. Pyrite powder decomposed at 1023–1073 K 4–6 h Ar; run product then retrieved reheated 1 1498–1598 N2 (gas). minerals analyzed with scanning electron microscope, X-ray diffraction (XRD) room temperature, situ high-temperature XRD. primary observation from shift major peak ~43.2°2θ ~43.8°2θ. spectra matched an XRD analysis natural Slight contamination Fe observed during cooling troilite, alumina crucibles locally reacted habitus size crystals allowed us store it as grains rather than powder; 27 g yielded 17 stochiometric