The Microscopic Structure of Minerals forming Serpentine, and their Relation to its History

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Abstract
I. I ntroduction . A lthough so much has been written about serpentine during the last thirty years, a few points, as we think, still require to be cleared up. So we propose to describe in this paper, though it will mean some repetition of details already in print, the changes by which that mineral, or group of minerals, is produced from certain magnesian or ferromagnesian silicates. One of us published his first paper on this subject in the beginning of 1877, and since then he has been able to do some field-work on the rock on an average at least once a year. Of the specimens thus procured a number have been sliced for microscopic study, and others acquired by gift or purchase, so that his collection now includes about 180 sections of peridotites and serpentines, besides a large number containing more or less altered single grains of the parent-minerals. From the study of these, and of other specimens in the cabinets of friends, the opinions expressed in this paper have been independently formed, and it would have been written half a dozen years ago, if his arrangements had permitted him to visit certain localities, concerning which, as he believed, incorrect statements had been made. That task was kindly undertaken by the other contributor to this paper, who, in the summer of 1904, supplied the last link by visiting Sprechenstein and the Brenner district. Prior to this she had made a special study of the serpentines of Anglesey and of the Voges,

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