Project Gutenberg 2015-01-16 Public domain in the USA. 130 Geological Survey (U.S.) U.S.G.S. U.S. Geological Survey United States. Department of the Interior. Geological Survey Natural Gemstones Produced by Stephen Hutcheson, Dave Morgan, Carol Spears and the Online Distributed Proofreading Team at http://www.pgdp.net "Natural Gemstones" by Geological Survey is a scientific publication likely written in the late 20th century. The book provides an overview of natural gemstones, discussing their classification as precious or semiprecious, as well as the geologic environments in which they form. It serves as a comprehensive resource for collectors, hobbyists, and anyone interested in the identification and evaluation of gemstones. The content of the book spans various topics related to gemstones, including descriptions of different types of minerals, their formation processes, and specific properties such as hardness and specific gravity. It explains the various geological environments where gemstones are found, such as pegmatites and stream gravels, highlighting that these natural treasures are often rare and scattered. Additionally, the publication provides insights into organic gemstones, gemstone valuation, and tips for prospective buyers to navigate the market wisely, especially concerning synthetic gems. The book acts as an essential guide for amateur gemologists and collectors looking to deepen their understanding of the world of gemstones. (This is an automatically generated summary.) en Precious stones -- United States Precious stones -- Collection and preservation -- United States Gems -- United States QE Text Browsing: Nature/Gardening/Animals Browsing: Science - General 75697 75727 2024-09-20T06:30:32.851887 2023-09-20T16:21:43.516024 text/html text/html 69899 2015-01-16T15:04:14 text/html; charset=utf-8 645746 2015-01-16T15:04:54 text/html; charset=utf-8 application/zip 705886 2024-09-20T06:30:37.883868 application/epub+zip 704291 2024-09-20T06:30:35.061907 application/epub+zip 88963 2024-09-20T06:30:34.121895 application/epub+zip 745998 2024-09-20T06:30:39.655858 application/x-mobipocket-ebook 736408 2024-09-20T06:30:36.999901 application/x-mobipocket-ebook 122608 2022-09-21T18:35:34.179350 application/x-mobipocket-ebook 47939 2024-09-20T06:30:32.306880 text/plain; charset=us-ascii 48176 2015-01-16T15:04:10 text/plain; charset=utf-8 17794 2015-01-16T15:04:54 text/plain; charset=utf-8 application/zip 48175 2015-01-16T15:04:44 text/plain; charset=iso-8859-1 17735 2015-01-16T15:04:54 text/plain; charset=iso-8859-1 application/zip 19902 2024-09-20T06:30:39.783851 application/rdf+xml 21974 2024-09-20T06:30:34.196877 image/jpeg 3843 2024-09-20T06:30:34.158891 image/jpeg 649351 2024-09-20T06:30:32.884900 application/octet-stream application/zip Archives containing the RDF files for *all* our books can be downloaded at https://www.gutenberg.org/wiki/Gutenberg:Feeds#The_Complete_Project_Gutenberg_Catalog en.wikipedia