5.4 Olivine Melting Diagram Olivine is a common mineral with a chemical composition that ranges from pure Mg-olivine (forsterite) to pure Fe-olivine (fayalite). Other elements, notably Mn, can be found in olivine, but olivine compositions are largely a two-component mixture of forsterite and fayalite. A phase diagram based on the melting of olivine looks a lot like the water-ethanol boiling …
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