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Mar 08

How hard is a Penny then??


The Mohs scale of mineral hardness consists of ten different minerals, but some other common objects can also be used: these include the fingernail (hardness 2.5), a steel knife or window glass (5.5), a steel file (6.5), and a penny.

Read on.....http://geology.about.com/od/mineral_ident/a/coinmohs.htm

Posted by Jay Roberts at 06:06 PM | Permalink

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