INTRODUCTION
Through a variety of circumstances unnecessary to enumerate, this study has extended over a period of 25 years, and several of those to whom I am personally indebted are no longer living. Certain obligations, however, are too great to remain unmentioned.
Dr. John E. Wolff first suggested that I undertake the comprehensive study of the mineralogy of the Franklin district, my first visit to which was made in his company, and his aid has always been freely given. His intimate knowledge of the geology and mineralogy of the New Jersey Highlands, gained by years of close study, scant credit for which was given in the reports dealing with the area, has made his counsel particularly valuable.
To Mr. F. A. Canfield, who died in 1927, thanks were due for hospitality extended on repeated occasions, for invaluable information, for material for study, and for an excellent collection of photographs of his choicest specimens. Col. W. A. Roebling, until his death in 1927, repeatedly supplied material for investigation and comparison, and the study of his collection on more than one occasion yielded valuable data. Mr. Lazard Cahn has brought to the Harvard mineral collection, through a long term of years, many unusual specimens which his keen and discriminating eye had discovered in the local collections at Franklin, and these were placed freely at my disposal for study.
Mr. R. B. Gage, chemist of the Highway Commission of New Jersey, has supplied valuable chemical analyses and much material for study. Dr. C. H. Warren has contributed some unpublished analyses, and his friendly counsel has often been sought. During the last few years the most prolific source of information has been the staff of the chemical laboratory of the New Jersey Zinc Co. at Franklin. Mr. David Jenkins and Mr. L. H. Bauer have collaborated with me in many investigations, and several chemical analyses of Franklin minerals, made by them, are published here with the permission of the company.
To my colleague, Prof. E. S. Larsen, I am indebted for numerous optical determinations and for kindly advice, freely given. Also my assistants, Harry Berman and L. W. Lewis (died, 1933), have given me constant and unfailing help in optical and crystallographic determinations, in the separation of samples for chemical analysis, and in the preparation of many of the figures of crystals. Mr. Berman has also collaborated in the preparation of several papers on the minerals of the district. Mr. F. A. Gonyer has made several of the most recent analyses. Dr. Laurence LaForge has made a critical revision of the whole manuscript and has done much to eliminate from it the discrepancies resulting from repeated rewriting of parts of the text through a long period of years. He also made several of the drawings of crystals.
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© by Herb Yeates 1997-2006.
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