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2. Quartz - Wikipedia

   en.wikipedia.org/wiki/Quartz

   Quartz is a hard, crystalline mineral composed of silica (silicon dioxide). ... a qualitative scratch method for determining the hardness of a material to abrasion.

3. Mohs scale - Wikipedia

   en.wikipedia.org/wiki/Mohs_scale

   For example, some sources have assigned a Mohs hardness of 6 or 7 to granite but it is a rock made of several minerals, each with its own Mohs hardness (e.g. topaz-rich granite contains: topaz — Mohs 8, quartz — Mohs 7, orthoclase — Mohs 6, plagioclase — Mohs 6–6.5, mica — Mohs 2–4).

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

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

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

5. Fused quartz - Wikipedia

   en.wikipedia.org/wiki/Fused_quartz

   Fused quartz, fused silica or quartz glass is a glass consisting of almost pure silica (silicon dioxide, SiO 2) ... Hardness: 5.3–6.5 (Mohs scale), 8.8 ...

6. Knoop hardness test - Wikipedia

   en.wikipedia.org/wiki/Knoop_hardness_test

   The Knoop hardness test / k ... Quartz: 820 Silicon carbide: 2480 Diamond: 7000 = () = where: L is the length of indentation along its long axis C p is the ...

7. Hardness comparison - Wikipedia

   en.wikipedia.org/wiki/Hardness_comparison

   A variety of hardness-testing methods are available, including the Vickers, Brinell, Rockwell, Meyer and Leeb tests. Although it is impossible in many cases to give an exact conversion, it is possible to give an approximate material-specific comparison table for steels .

8. Dumortierite - Wikipedia

   en.wikipedia.org/wiki/Dumortierite

   It has a Mohs hardness of 7 and a specific gravity of 3.3 to 3.4. Crystals show pleochroism from red to blue to violet. Dumortierite quartz is blue colored quartz containing abundant dumortierite inclusions.

9. Vickers hardness test - Wikipedia

   en.wikipedia.org/wiki/Vickers_hardness_test

   The unit of hardness given by the test is known as the Vickers Pyramid Number (HV) or Diamond Pyramid Hardness (DPH). The hardness number can be converted into units of pascals , but should not be confused with pressure , which uses the same units.