Mohs Hardness Scale
A man named Friedrich Mohs knew that different minerals have different hardness! Soft minerals have low numbers. Hard minerals have high numbers.
Mohs scale number (mineral example)
Hardness of other common objects
You can figure out the hardness of a mineral! Try to scratch it with your fingernail. If your fingernail cannot scratch the mineral, you know it has a hardness of more than 2.5. If the mineral can't scratch glass, you know it has a hardness of less than 5.5.
Last modified May 1, 2003 by Lisa Gardiner.
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The Fall 2010 issue of The Earth Scientist
, focuses on rocks and minerals, including articles on minerals and mining, the use of minerals in society, and rare earth minerals, and includes 3 posters!
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