Publisher's Synopsis
Excerpt from Contributions to the Geology of Washington: Geology and Physiography of Central Washington
Subsequently in his work, Theoretische Geologic, he reproduces two of these diagrams and introduces others showing the proportions of chemical components in two series of minerals (feldspars and pyroxenes) and others showing the proportions of the chief minerals in three kinds of rocks. One diagram consists of adjacent, long, narrow rectangles, each divided into rectangular parts proportionate to the percentages of the oxide constituents in certain kinds of rocks, from granite to gabbro, and in five types of meteorites.
Judd, in his book on Volcanoes. In 1881, makes use of a diagram to represent the varying amounts of chemical elements in rocks and meteorites. It is similar in form to one used by Reyer. Already described.
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