Greigite as an Intermediate in Pyrite Formation
Author Information
Author(s): Hunger Stefan, Benning Liane G
Primary Institution: University of Leeds
Hypothesis
Greigite is formed as an intermediate on the pathway from mackinawite to pyrite.
Conclusion
The study provides evidence that greigite is a true intermediate in the transformation of mackinawite to pyrite under hydrothermal conditions.
Supporting Evidence
- Greigite was observed as an intermediate phase at temperatures above 125°C.
- The kinetics of the transformation followed a zero-order rate law.
- Activation parameters for the transformation were determined from temperature dependence of rate constants.
Takeaway
This study shows that a mineral called greigite forms when another mineral, mackinawite, changes into pyrite, which is important for understanding how these minerals form in nature.
Methodology
Hydrothermal synchrotron-based energy dispersive X-ray diffraction methods were used to investigate the transformation of mackinawite to greigite and pyrite.
Limitations
The study's findings are based on specific experimental conditions and may not fully represent all natural environments.
Digital Object Identifier (DOI)
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