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Cutting en cabochon (French: "in the manner of a cabochon") is usually applied to opaque gems, while faceting is usually used for transparent stones. Hardness is also taken into account as softer gemstones with a hardness lower than 7 on the Mohs hardness scale are easily scratched, mainly by silicon dioxide in dust and grit.
Toggle the table of contents. Hardnesses of the elements (data page) 10 languages. ... Mohs hardness of materials (data page) Vickers hardness test; Brinell scale
Just as the angle of the sides of a cabochon creates the pressure to hold the stone in place, so there is an overlying principle in setting faceted stones. If one looks at a side view of a round diamond, for example, one will see that there is an outer edge, called the girdle, and the top angles up from there, and the bottom angles down from there.
A bowenite cabochon featured as part of the "Our Mineral Heritage Brooch", was presented to U.S. First Lady Mrs. Lady Bird Johnson in 1967. Williamsite is an American local varietal name for antigorite that is oil-green with black crystals of chromite or magnetite often included. Somewhat resembling fine jade, williamsite is cut into cabochons ...
Its hardness is 8, its specific gravity is 3.5–4.1, and it is transparent to opaque with a vitreous to dull luster. ... Toggle the table of contents. Spinel.
Created Date: 8/30/2012 4:52:52 PM
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 .
It has a Mohs hardness of six, a Vickers hardness of 7.7 GPa at a load of 0.98 N, [5] and a specific gravity of 3.25 to 3.55. It is transparent to translucent with indices of refraction of n α =1.663–1.699, n β =1.671–1.705, and n γ =1.693–1.728. The optic angle is 58° to 63°.
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