National Audubon Society Field Guide to North American Rocks and Minerals


National Audubon Society Field Guide to North American Rocks and Minerals

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GB-80000026
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1 available
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1.50 lbs
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$19.95
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Perfect for mountain climbers and hikers, this valuable reference covers more rocks and minerals in North America than any other available guide. 794 full-color photographs depict all the important rocks, gems, and minerals -- in many variations of color and crystal form -- and the natural environments in which they occur; written descriptions provide information on field marks, similar rocks and minerals, environment, areas of occurrence, and derivation of names. Includes a guide to mineral collecting and a list of rock-forming minerals.
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    Third Edition, Thirteenth Printing, October 2013. (Third Edition dated 2005, and revised in 2006)

    First Printing, January 1995
    Second (Revised) Printing, Second Edition, January 1996
    Third Printing, Second Edition, April 1997
    Fourth Printing, Second Edition, October 1998
    Fifth Printing, Second Edition, March 2000
    Sixth Printing, Second Edition, June 2001
    Seventh Printing, Second Edition, September 2002
    Eighth Printing, Second Edition, March 2003
    Ninth Printing, Second Edition, July 2004
    Tenth (Revised) Printing, Third Edition, August 2005
    Eleventh (Revised) Printing, Third Edition, August 200
    Twelfth Printing, Third Edition, July 2007
    Thirteenth Printing, Third Edition, October 2013
    Printing,
    Printing,
    Printing,
    Printing,
    Printing,
    Printing,
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    Hardness is one property of a mineral that can be used to distinguish among similar minerals. A given mineral can scratch any other mineral of the same or softer hardness. Over a hundred years ago, the German mineralogist Frederick Mohs devised the relative hardness scale that has found favor with mineralogists for over a century. Others, such as Rosiwal, formed absolute hardness scales using the same minerals as Mohs. For example, diamond, the hardest substance in Nature is not twice as hard as apatite, 10 versus 5, but over twenty thousand times as hard, 140,000 versus 6.5.

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