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2. Tiger's eye - Wikipedia

   en.wikipedia.org/wiki/Tiger's_eye

   Tiger's eye (also called tiger eye) is a chatoyant gemstone that is usually a metamorphic rock with a golden to red-brown colour and a silky lustre.As members of the quartz group, tiger's eye and the related blue-coloured mineral hawk's eye gain their silky, lustrous appearance from the parallel intergrowth of quartz crystals and altered amphibole fibres that have mostly turned into limonite.

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

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

   Mohs hardness [1] Vickers hardness ... (diamond) 10.0: 11: Na: sodium: 0.5: 0.69: 12: Mg: ... Mohs scale of mineral hardness; Mohs hardness of materials (data page) ...

4. Mohs scale - Wikipedia

   en.wikipedia.org/wiki/Mohs_scale

   Diamond was the hardest known naturally occurring mineral when the scale was designed, and defines the top of the scale, arbitrarily set at 10. The hardness of a material is measured against the scale by finding the hardest material that the given material can scratch, or the softest material that can scratch the given material.

5. Quartz - Wikipedia

   en.wikipedia.org/wiki/Quartz

   Quartz is the mineral defining the value of 7 on the Mohs scale of hardness, ... Herkimer diamond: Colorless: Transparent Rock crystal: ... Tiger's eye: Fibrous gold ...

6. Scratch hardness - Wikipedia

   en.wikipedia.org/wiki/Scratch_hardness

   The first scientific attempt to quantify materials by scratch tests was by mineralogist Friedrich Mohs in 1812 (see Mohs scale). [3] [4] The Mohs scale is based on relative scratch hardness of different materials; with talc assigned a value of 1 and diamond assigned a value of 10. [5] Mohs's scale had two limitations: it was not linear, and ...

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. Material properties of diamond - Wikipedia

   en.wikipedia.org/wiki/Material_properties_of_diamond

   Known to the ancient Greeks as ἀδάμας (adámas, 'proper, unalterable, unbreakable') [3] and sometimes called adamant, diamond is the hardest known naturally occurring material, and serves as the definition of 10 on the Mohs scale of mineral hardness. Diamond is extremely strong owing to its crystal structure, known as diamond cubic, in ...

9. Diamond simulant - Wikipedia

   en.wikipedia.org/wiki/Diamond_simulant

   The Mohs scale of mineral hardness is a non-linear scale of common minerals' resistances to scratching. Diamond is at the top of this scale (hardness 10), as it is one of the hardest naturally occurring materials known. (Some artificial substances, such as aggregated diamond nanorods, are harder.) Since a diamond is unlikely to encounter ...