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hardnesses - 2 dictionary results
hard·ness     (härd'nĭs)  Pronunciation Key 
n.  
  1. The quality or condition of being hard.
  2. The relative resistance of a mineral to scratching, as measured by the Mohs scale.
  3. The relative resistance of a metal or other material to denting, scratching, or bending.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2006 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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hardness   (härd'nĭs)  Pronunciation Key 
A measure of how easily a mineral can be scratched. Hardness is measured on the Mohs scale.

The American Heritage® Science Dictionary
Copyright © 2002 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
Cite This Source
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