The Fluorspar Deposits of Hardin and Pope Counties; Illinois State Geological Survey Bulletin No. 58


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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 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. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. To ensure a quality reading experience, this work has been proofread and republished using a format that seamlessly blends the original graphical elements with text in an easy-to-read typeface. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.










Bulletin


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Geological Survey Bulletin


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Prepared on behalf of the U.S. Atomic Energy Commission.







Cahokia and the Hinterlands


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Covering topics as diverse as economic modeling, craft specialization, settlement patterns, agricultural and subsistence systems, and the development of social ranking, Cahokia and the Hinterlands explores cultural interactions among Cahokians and the inhabitants of other population centers, including Orensdorf and the Dickson Mounds in Illinois and Aztalan in Wisconsin, as well as sites in Minnesota, Iowa, and at the confluence of the Mississippi and Ohio rivers. Proposing sophisticated and innovative models for the growth, development, and decline of Mississippian culture at Cahokia and elsewhere, this volume also provides insight into the rise of chiefdoms and stratified societies and the development of trade throughout the world.




The Collector’s Book of Fluorescent Minerals


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Over the last several decades, the number of people who are actively involved in the hobby or science of mineral collecting has grown at an increasing pace. In response to the growing demand for informa tion which this large and active group has created, a number of books have been published dealing with mineralogy. As a result, the reader now has a choice among mineral locality guides, field handbooks, photo collections, or books dedicated to the systematic description of minerals. However, as interest in mineralogy has grown, as collectors have become increasingly knowledgeable and aware of mineralogy in its many facets, the need for more specialized information has also grown. Nowhere is this need greater than in the subject of the fluorescence of minerals. The number of collectors who now main tain a fluorescent collection is substantial, interest is constantly increasing, and manufacturers have recently responded by the intro duction of new ultraviolet equipment with major improvements in utility and performance. Yet when the collector searches for any information on this subject, little will be found. He or she will seek in vain for the answers to questions which present themselves as in terest in fluorescent minerals grows and matures. Which minerals fluoresce? Where are fluorescent minerals found? What makes a mineral fluoresce? Why does ultraviolet light produce fluorescence? What is an activator, and how does it contribute to fluorescence? On these matters, the available mineralogy books are largely silent.