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Mohs scale

[mohz] /moʊz/
noun
1.
a scale of hardness used in mineralogy. Its degrees, in increasing hardness, are: talc 1; gypsum 2; calcite 3; fluorite 4; apatite 5; feldspar 6; quartz 7; topaz 8; sapphire 9; diamond 10.
Abbreviation: MSH.
Origin
1875-1880
1875-80; named after F. Mohs (1773-1839), German mineralogist
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for Mohs scale

Mohs scale

/məʊz/
noun
1.
a scale for expressing the hardness of solids by comparing them with ten standards ranging from talc, with a value of 1, to diamond, with a value of 10
Word Origin
C19: named after Friedrich Mohs (1773–1839), German mineralogist
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Mohs scale in Science
Mohs scale
  (mōz)   
A scale used to measure the relative hardness of a mineral by its resistance to scratching. From softest to hardest, the ten minerals of the Mohs scale are talc (measuring 1 on the scale), gypsum, calcite, fluorite, apatite, orthoclase, quartz, topaz, corundum, and diamond (measuring 10 on the scale).
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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