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  2. Mohs scale - Wikipedia

    en.wikipedia.org/wiki/Mohs_scale

    Mohs hardness kit, containing one specimen of each mineral on the ten-point hardness scale. The Mohs scale (/ m oʊ z / MOHZ) of mineral hardness is a qualitative ordinal scale, from 1 to 10, characterizing scratch resistance of minerals through the ability of harder material to scratch softer material.

  3. Hardnesses of the elements (data page) - Wikipedia

    en.wikipedia.org/wiki/Hardnesses_of_the_elements...

    Mohs scale of mineral hardness; Mohs hardness of materials (data page) Vickers hardness test; Brinell scale This page was last edited on ...

  4. Carnelian - Wikipedia

    en.wikipedia.org/wiki/Carnelian

    Carnelian Sard Color Lighter, with shades ranging from orange to reddish brown Darker, with shades ranging from a deep reddish brown to almost black Hardness Softer Harder and tougher Fracture Uneven, splintery and conchoidal Like carnelian, but duller and more hackly (having the appearance of something that has been hacked, i.e. jagged)

  5. Hardness scales - Wikipedia

    en.wikipedia.org/wiki/Hardness_scales

    The Mohs scale of mineral hardness; The Vickers hardness test; The Brinell scale; The Janka hardness test; The Rockwell scale; The Durometer scale; The Barcol scale;

  6. Scratch hardness - Wikipedia

    en.wikipedia.org/wiki/Scratch_hardness

    Mohs's scale had two limitations: it was not linear, and most modern abrasives fall between 9 and 10.; [6] [7] so, later scientists attempted to increase resolution at the harder end of the scale. Raymond R. Ridgway, a research engineer at the Norton Company, modified the Mohs scale by giving garnet a hardness of 10 and diamond a hardness of 15.

  7. Portal:Minerals - Wikipedia

    en.wikipedia.org/wiki/Portal:Minerals

    The Mohs scale of mineral hardness, based on scratch hardness comparison, defines value 1 as the hardness of talc, the softest mineral. When scraped on a streak plate , talc produces a white streak, though this indicator is of little importance, because most silicate minerals produce a white streak.

  8. Hardness - Wikipedia

    en.wikipedia.org/wiki/Hardness

    When testing coatings, scratch hardness refers to the force necessary to cut through the film to the substrate. The most common test is Mohs scale, which is used in mineralogy. One tool to make this measurement is the sclerometer. Another tool used to make these tests is the pocket hardness tester. This tool consists of a scale arm with ...

  9. Chrysoprase - Wikipedia

    en.wikipedia.org/wiki/Chrysoprase

    Mohs scale hardness: 6.0–7.0: Luster: Greasy, waxy ... carnelian, and onyx. Unlike many non-transparent silica minerals, it is the color of chrysoprase, rather than ...

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