To answer your question accurately, I'd need to know which specific mineral you are referring to in "Q11.B." However, in general terms, magmatic differentiation typically involves two key processes:
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Crystallization: As magma cools, different minerals crystallize out of the melt at varying temperatures. This leads to the formation of different mineral compositions within the magma. For example, olivine and pyroxene crystallize at higher temperatures, while minerals like quartz and feldspar crystallize at lower temperatures.
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Fractional crystallization: This is the process where the early-formed crystals are removed from the melt. As these crystals settle out of the magma, the remaining liquid becomes enriched in the incompatible elements, which can significantly alter the composition of the remaining melt and lead to the formation of different types of igneous rocks.
If you can provide the specific mineral you are referencing, I can give you a more detailed and tailored answer.