Name another factor, other than the rate of cooling, that can affect crystal size. Very coarse-grained intrusions of igneous rocks (pegmatites) are an example of this factor at work.
Answer to relevant QuestionsWhy do many of the late-forming pegmatites of the previous question contain rare elements such as lithium, tin, and beryllium?Figure 3.9(b) depicts a pile of pillows tilted to a vertical position. In which direction are the pillows topping (that is, which is the top of the sequence?)What is the volcanic rock which has the same composition as a granite?What could happen to the cities shown in Fig. 3.13 if any of the nearby volcanoes erupted?If volcanoes are dangerous, as illustrated when Mt. St. Helens erupted in May 1980, why are some volcanic regions such as Sumatra in the East Indies so densely populated?
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