Optical mineralogy / Оптическая минералогия

Austin F. Rogers, the senior author of the first two editions of this text and professor emeritus in mineralogy at Stanford University, passed away at Berkeley, California, in April, 1957. His wise counsel as a former professor and his judgment as a mineralogist have been greatly missed during this revision. On the other hand, many readers, particularly those most familiar with Professor Rogers and his work, will recognize the influence of his teaching and will remember portions of the text which remain unchanged in the third edition.
Sixteen years have elapsed since the second edition of this text appeared. The fidelity of the readers who have maintained a steady demand over this period indicates that the general features of the second edition have been found useful and consequently they are retained. The first objective in this revision has been concern over the student who has found difficulty with the phraseology or explanations of previous editions. Within the limitations of space every effort has been made to prepare a text which could be used with a minimum of supervision and a maximum of self-instruction. Optical mineralogy is acquired by the student with greatest facility with a good set of illustrative material under competent classroom instruction. On the other hand, experience has shown that a considerable number, lacking classroom facilities and desirous of learning the techniques described, have made considerable
progress with representative thin sections and the text alone. <...>