Transformation of synthetic mackinawite to hexagonal pyrrhotite: a kinetic study

A. R. Lennie, K. E.R. England, D. J. Vaughan

Research output: Contribution to journalArticlepeer-review


The kinetics of the transformation of synthetically prepared mackinawite to hexagonal pyrrhotite have been studied to clarify the relationship between these two phases. Kinetic analysis using the Johnson-Mehl equation is based on measurements of the fraction of hexagonal pyrrhotite obtained by heating mackinawite samples in the temperature range of 530-545 K. This gives isothermal rate constants from which an activation energy of 493 kJ/mol and a frequency factor of 3.7 × 1045 min-1 have been established. The mechanism proposed for this transformation is that of a solid-state diffusion process. Kinetic data derived from this experiment may be used to show that persistence of mackinawite in nature can be explained by kinetic factors alone. -from Authors

Original languageEnglish
Pages (from-to)960-967
Number of pages8
JournalAmerican Mineralogist
Issue number9-10
Publication statusPublished - 1995


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