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Microhardness, toughness, and modulus of Mohs scale minerals
-
Margaret E. Broz
,
Robert F. Cook
Published/Copyright:
March 31, 2015
Abstract
We report new results of microhardness and depth-sensing indentation (DSI) experiments for the fist nine minerals in the Mohs scale: talc, gypsum, calcite, fluorite, apatite, orthoclase, quartz, topaz, and corundum. The Mohs scale is based on a relative measure of scratch resistance, but because scratching involves both loading and shearing, scratch resistance is not equivalent to hardness as measured by modern loading (indentation) methods; scratch resistance is also related to other material properties (fracture toughness, elastic modulus). To better understand the relationship of hardness to scratch resistance, we systematically determined hardness, fracture toughness, and elastic modulus for Mohs minerals. We measured hardness and toughness using microindentation, and modulus and hardness with DSI (.nanoindentation.) experiments. None of the measured properties increases consistently or linearly with Mohs number for the entire scale.
Keywords : Mechanical properties; hardness; fracture toughness; elastic modulus; Mohs minerals; new technique; nanoindentation
Received: 2004-11-3
Accepted: 2005-6-1
Published Online: 2015-3-31
Published in Print: 2006-1-1
© 2015 by Walter de Gruyter Berlin/Boston
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Keywords for this article
Mechanical properties;
hardness;
fracture toughness;
elastic modulus;
Mohs minerals;
new technique;
nanoindentation
Articles in the same Issue
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- A low-temperature heat-capacity study of synthetic anhydrous Mg-cordierite (Mg2Al4Si5O18)
- Dissolution kinetics of pyrochlore ceramics for the disposition of plutonium
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- Fe2+/Fe3+ charge ordering in contact layers of lamellar magnetism: Bond valence arguments
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