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Recommended reading

I found the following books useful in researching this article :

Rocks & Minerals of The World
An Illustrated Encyclopedia
(Text) by Rodolf Duda & Lubos Rejl
TigerBooks International PLC
ISBN 1-84056-025-8

Dorling Kindersley - Eyewitness Handbooks: Gem Stones
The visual guide to more than 130 gemstone varieties
By Cally Hall
ISBN 0-7513-1026-3

Dorling Kindersley - Eyewitness Handbooks: Rocks & Minerals
The visual guide to more than 500 rock & mineral specimens from around the world
By Chris Pellant
ISBN 0-86318-810-9

Mineral Collector's Handbook
By Barry Krause
Sterling Publishing Co.
ISBN 0-8069-0873-4

Minerals & Gemstones of the World
A David & Charles book
ISBN: 0-7153-0197-7