Major processes within the earth’s crust

We shall now consider the major processes within the earth’s crust which lead to the formation and metamorphism of rocks, so as to obtain an insight into the conditions under which the fine mineral specimens and well-shaped crystals which adorn our collections were formed.

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THE PROCESSES OF MINERAL FORMATION

In the text-books of mineralogy, minerals are usually classed according to their chemical compo­sition and atomic structure. The plates in this book are arranged in such a way that minerals with a common mode of origin are grouped together. They are thus grouped in the first place, according to origin, into igneous, sedimentary and metamorphic minerals. Minerals which are closely related chemically, or whose atomic structure is very much alike, are often shown in quite different parts of the book, and some of the minerals appear more than once. This arrangement is intended to bring out the fact that no mineral is ever formed in isolation, and that the association of certain mineral species is governed by physical and chemical laws.

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