Gemstones and their origins

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Van Nostrand Reinhold, 1990 - Antiques & Collectibles - 144 pages
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Explains how precious stones are formed, describes where they are found, and discusses the mining processes used to recover them

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Contents

Gemstones of IgneousHydrothermal Origin
35
Gemstones Formed by Very High Temperatures and Pressures
83
Gemstones Formed at Groat Depths
115
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About the author (1990)

PETER KELLER is an engineer at Tektronix, Inc. in Beaverton, Oregon. He is the former chairman of the EIA JT-20 Display CRT Standards Committee and of the Society for Information Display Definitions and Standards Committee. Mr. Keller is the author of numerous papers, articles, and a previous book, The Cathode-Ray Tube: Technology, History, and Applications.

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