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  2. Moissanite - Wikipedia

    en.wikipedia.org/wiki/Moissanite

    Moissanite (/ ˈmɔɪsəˌnaɪt /) [ 5 ] is naturally occurring silicon carbide and its various crystalline polymorphs. It has the chemical formula SiC and is a rare mineral, discovered by the French chemist Henri Moissan in 1893. Silicon carbide or moissanite is useful for commercial and industrial applications due to its hardness, optical ...

  3. Silicon carbide - Wikipedia

    en.wikipedia.org/wiki/Silicon_carbide

    As a gemstone used in jewelry, silicon carbide is called "synthetic moissanite" or just "moissanite" after the mineral name. Moissanite is similar to diamond in several important respects: it is transparent and hard (9–9.5 on the Mohs scale, compared to 10 for diamond), with a refractive index between 2.65 and 2.69 (compared to 2.42 for diamond).

  4. Extraterrestrial diamonds - Wikipedia

    en.wikipedia.org/wiki/Extraterrestrial_diamonds

    On Earth, the natural form of silicon carbide is a rare mineral, moissanite. [19] In the Solar System the rocky planets Mercury, Venus, Earth and Mars are 70% to 90% silicates by mass. By contrast, stars with a high ratio of carbon to oxygen may be orbited by planets that are mostly carbides, with the most common material being silicon carbide ...

  5. Refractive index - Wikipedia

    en.wikipedia.org/wiki/Refractive_index

    The refractive index, n{\displaystyle n}, can be seen as the factor by which the speed and the wavelengthof the radiation are reduced with respect to their vacuum values: the speed of light in a medium is v= c/n, and similarly the wavelength in that medium is λ= λ0/n, where λ0is the wavelength of that light in vacuum.

  6. Jewellery - Wikipedia

    en.wikipedia.org/wiki/Jewellery

    Jewellery. Jewellery (or jewelry in American English) consists of decorative items worn for personal adornment such as brooches, rings, necklaces, earrings, pendants, bracelets, and cufflinks. Jewellery may be attached to the body or the clothes. From a western perspective, the term is restricted to durable ornaments, excluding flowers for example.

  7. List of mineral symbols - Wikipedia

    en.wikipedia.org/wiki/List_of_mineral_symbols

    Mineral symbols are most commonly represented by three-lettered text symbols, although one-, two- and four-lettered symbols also exist. Four methods of nomenclature are used: [ 3 ][ 5 ] The initial letters of a name, for example: cyanotrichite: Cya and mitscherlichite: Mits. A combination considered characteristic of the mineral name, for ...

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