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'The Alteration Of A Diabase Dike, Isabella Mine, Marquette Iron District, Michigan' presents a detailed geological study by George Francis Barnwell. This report focuses on the mineralogical and structural changes observed in a diabase dike located within the Isabella Mine, a prominent site in Michigan’s Marquette Iron District. The study offers insights into the processes of rock alteration under specific geological conditions, valuable for researchers and students in geology, mineralogy, and mining engineering.Barnwell’s work provides a focused examination of how diabase, a common igneous rock, transforms when exposed to environmental factors within an iron mining context. This investigation contributes to a greater understanding of mineral evolution and the effects of geological activity on rock formations. The document serves as a historical record of mining geology practices and a reference for comparative studies in similar geological settings.This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original work as possible. Therefore, you will see the original copyright references, library stamps (as most of these works have been housed in our most important libraries around the world), and other notations in the work.This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work.As a reproduction of a historical artifact, this work may contain missing or blurred pages, poor pictures, errant marks, etc. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.