This is particularly true of the influence of mathematics and physics on crystaIlo graphy and of geology on petrology. The changing emphasis on the one or the other branches of our science, however, has not always been beneficiaI.
For example, it has resulted in judgments such 80S the following, attributed to the renowned mineralogist A.
The far-sighted geologist L. The ques tion as to whether a new edition should be produced was answered affirmatively on many counts.
I think that the considerations which led me to write this book in are still valid see Preface to the First Edition. Moreover, a description of those areas of interest which together comprise the field of Mineralogy seems to be more necessary than ever, because of the rapid advances which have been made.
Due to the rapid extension of our knowledge, I did not dare again to treat the whole field by myself. He made many important corrections. In Part II the basic question arose as to whether the physical-chemical approach to rock forming processes, becoming more and more important, required inclusive treatment of the fundamentals of physical chemistry in the book.
I see certain dangers in trying to produce a petrology text which is physical chemically self-sufficient. Thus, I retain the same opinion which prevailed when I wrote the previous edition; namely that the necessary basic knowledge should be acquired in lectures and laboratory classes in physics, chemistry, and physical chemistry, and with the help of standard literature dealing with these subjects. This back ground is, therefore, presumed and fundamentals are only referred to occasionally.
In the field, a preliminary classification is usually made by macroscopic means. However, it is often necessary to make a more careful classification by a microscopic examination of a thin section of the minerals comprising the rock mass.
To do this successfully requires a knowledge of the application of light to crystalline substances. This volume differs from most of the reference and text books relating to this subject in that it incorporates in one volume the elements of optical mineralogy and the elements of petrography.
In Part One, eight general operations for the determination of unknown minerals in thin section are described, prefaced by a short summary of the principles of optics which apply to the transmission of polarized light through minerals. Descriptions of fiftyeight of the most common of the rock-making minerals are given, special attention being given to the criteria for the determination of these minerals in thin section. Their form, cleavage, twinning, color, refringence, bi refringence, extinction angles, pleochroism, absorption, optical character, inclusions, alterations, occurrences, uses, and differentiation from similar minerals, are all discussed whenever applicable.
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