Anderson, Alfred T., Jr. Department of Geophysical Sciences, University of Chicago, Chicago, Illinois.
- Rock description
- Additional Reading
The description of rocks with goals of classification and interpretation of origin. Most schemes for the classification of rocks are based on the size of grains and the proportions of various minerals. Interpretations of origin rely on field relations, structure, texture, and chemical composition as well as sizes and proportions of different kinds of grains. The names of rocks are based on the sizes and relative proportions of different minerals; boundaries between the names are arbitrary. The conditions of formation of a rock can be estimated from the types and textures of its constituent minerals. The illustration shows examples of petrographic features.
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