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Unmixing. Some homogeneous solid solutions of minerals are stable only at high temperatures. On cooling these become unstable and one mineral separates from the other at a certain temperature. An intergrowth of two separate minerals may result, e.g. perthite, an intergrowth of sodium and potassium feldspar. This occurs without loss or addition to the mineral as a whole.

Subjects: Earth Sciences and Geography.

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