Abstract
The phase distributions which have been observed in exsolved minerals often bear a marked resemblance, both in scale and morphology, to the phase distributions which have been observed in metallic alloys. At first this similarity appears anomalous for the cooling rates of naturally occurring minerals are 104 to 106 times slower than those usually encountered in alloys. However, the diffusivities in minerals are typically 104 to 106 times lower than in metals at equivalent temperatures and hence the size of microstructural features, which is to a first approximation proportional to \(\sqrt {Dt}\), where D is the diffusivity and t the time, are similar. This coincidence in the scale of microstructural features is fortunate for, while it is possible to study the development of phase distributions in the laboratory in metallic alloys, it is often not possible for the experimentalist to reproduce the microstructures of naturally exsolved minerals. Care must be taken when comparing simple metallic systems and the structurally and chemically-complex silicates; nevertheless the great wealth of well-documented information on precipitation reactions available in the metallurgical literature can be used to advantage when investigating exsolution in silicates.
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Champness, P.E., Lorimer, G.W. (1976). Exsolution in Silicates. In: Wenk, HR. (eds) Electron Microscopy in Mineralogy. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-66196-9_9
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