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Hardness Test: Quartz Scratches Calcite

Hardness, in mineralogy, is a measure of 'scratchability'; a material of a given hardness will scratch a material that is not as hard. More than a century ago, mineralogist Friedrich Mohs devised a hardness scale for minerals, called the Mohs scale. A mineral of hardness 7, such as quartz, will easily scratch a softer mineral, such as calcite (hardness 3). On the Mohs scale, talc is number 1 and diamond is number 10.
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Title:
Hardness Test: Quartz Scratches Calcite
Caption:
Hardness, in mineralogy, is a measure of 'scratchability'; a material of a given hardness will scratch a material that is not as hard. More than a century ago, mineralogist Friedrich Mohs devised a hardness scale for minerals, called the Mohs scale. A mineral of hardness 7, such as quartz, will easily scratch a softer mineral, such as calcite (hardness 3). On the Mohs scale, talc is number 1 and diamond is number 10.
Credit:
Album / Science Source / JOEL AREM
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Image size:
3785 x 2550 px | 27.6 MB
Print size:
32.0 x 21.6 cm | 12.6 x 8.5 in (300 dpi)
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