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2. 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).

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. Quartz - Wikipedia

   en.wikipedia.org/wiki/Quartz

   Quartz is the mineral defining the value of 7 on the Mohs scale of hardness, a qualitative scratch method for determining the hardness of a material to abrasion. Etymology [ edit ]

5. Quartzite - Wikipedia

   en.wikipedia.org/wiki/Quartzite

   Quartzite statue of an Egyptian Pharaoh, 14th century BCE [22] Quartzite biface hand axe from Stellenbosch, South Africa. Quartzite is a decorative stone and may be used to cover walls, as roofing tiles, as flooring, and stairsteps. Its use for countertops in kitchens is expanding rapidly. It is harder and more resistant to stains than granite.

6. Engineered stone - Wikipedia

   en.wikipedia.org/wiki/Engineered_stone

   Quartz is a much harder material. The Mohs scale hardness of marble is roughly 3, whereas that of quartz is around 7. This makes it much more resistant to scratching, however it also makes re-polishing and general processing a more difficult task, which is why it is most commonly used for kitchen counter tops, where the value added through ...

7. Prasiolite - Wikipedia

   en.wikipedia.org/wiki/Prasiolite

   Mohs scale hardness: 7 – lower in impure varieties [1] ... Prasiolite (also known as green quartz, green amethyst or vermarine) is a green variety of quartz.

8. What's the Difference Between Quartz and Quartzite? - AOL

   www.aol.com/lifestyle/whats-difference-between...

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9. Scratch hardness - Wikipedia

   en.wikipedia.org/wiki/Scratch_hardness

   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. [6] [8] Charles E. Wooddell, working at the Carborundum Company, extended the scale further by using resistance to abrasion, and extrapolating the scale based on 7 for quartz and 9 for corundum ...