Economic Mineralogy

Excerpt from Economic Mineralogy: A Practical Guide to the Study of Useful Minerals

Rocks may be defined as those materials which, in the form of beds and other masses, build up the crust of the earth. Usually they are complex or heterogeneous, and can be resolved into two or more minerals, as in granites, gabbros, mica-schists, and many other rocks but this is not invariably the case, and a rock may consist entirely or almost entirely of one mineral, as is the case with rock masses of dunite (olivine rock), serpentine, gypsum, rock-salt, crystalline limestone, magnesite, dolomite, quartzites, and some other rocks.

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