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Info & Ref.

Gems and Minerals:
Ref 1
Pellant, Chris, Pellant, Hellen; Smithsonian Handbooks Rocks And Minerals  Dorling Kindersley
     Limted, London, 2002  ISBN 978-0-7894-9106-0

Ref 2
Schumann, Walter, Handbook of Rocks, Minerals, and Gemstones, HarperCollins Publishers and 
     Houghton Mifflin Company, NewYork New York, 1985 ISBN - 0-395-51137-2

Ref 3
Mella, Dorothee, Stone Power, Warner Books Inc, New York NY, January 1988, ISBN  0-446-38696-0

1 comment:

helen thompson said...

great article, in my old age I am beginning to like pink more and more