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<p>in his <a href="page.php?w=Natural_History_%28Pliny%29">Naturalis Historia</a>, . The Mohs scale is useful for identification of minerals in the <a href="page.php?w=Field_research">field</a>, but is not an accurate predictor of how well materials endure in an industrial setting.</p>

<p><big>Reference minerals</big></p>
<p>The Mohs scale of mineral hardness is based on the ability of one natural sample of mineral to visibly scratch another mineral. <a href="page.php?w=Mineral">Mineral</a>s are chemically pure solids found in nature. <a href="page.php?w=Rock_%28geology%29">Rock</a>s</p><p>
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