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Best Answer: Intermediate rocks contain between 53% and 65% silica. They also contain potassium and plagioclase feldspar with a small amount of quartz.est Answer: Intermediate rocks contain between 53% and 65% silica. They also contain potassium and plagioclase feldspar with a small amount of quartz.
Hydration (adding water), which also reduces the temperature at which rocks melt. Besides, rocks aren't simple substances. They are a complex mixture of several mineral, each with independent composition and melting point. Because of that, a rock does not melt homogeneously. When a rock stats to melt, the minerals with the lower melting point melt first, and the minerals with higher melting point take a lot longer. Because of that, rock melting in nature is usually an incomplete, partial phenomena: only some minerals melt, while others remains solid.