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  2. Silicon - Wikipedia

    en.wikipedia.org/wiki/Silicon

    Silicon is a chemical element; it has symbol Si and atomic number 14. It is a hard, brittle crystalline solid with a blue-grey metallic lustre, and is a tetravalent metalloid and semiconductor. It is a member of group 14 in the periodic table: carbon is above it; and germanium, tin, lead, and flerovium are below it. It is relatively unreactive.

  3. Silicon carbide - Wikipedia

    en.wikipedia.org/wiki/Silicon_carbide

    Silicon carbide (SiC), also known as carborundum (/ ˌ k ɑːr b ə ˈ r ʌ n d əm /), is a hard chemical compound containing silicon and carbon. A wide bandgap semiconductor , it occurs in nature as the extremely rare mineral moissanite , but has been mass-produced as a powder and crystal since 1893 for use as an abrasive .

  4. Moissanite - Wikipedia

    en.wikipedia.org/wiki/Moissanite

    As natural sources of silicon carbide are rare, and only certain atomic arrangements are useful for gemological applications, North Carolina–based Cree Research, Inc., founded in 1987, developed a commercial process for producing large single crystals of silicon carbide. Cree is the world leader in the growth of single crystal silicon carbide ...

  5. Abundance of elements in Earth's crust - Wikipedia

    en.wikipedia.org/wiki/Abundance_of_elements_in...

    The rarest elements in the crust are not the heaviest, but are rather the siderophile elements (iron-loving) in the Goldschmidt classification of elements. These have been depleted by being relocated deeper into the Earth's core; their abundance in meteoroids is higher.

  6. Prices of chemical elements - Wikipedia

    en.wikipedia.org/wiki/Prices_of_chemical_elements

    This is a list of prices of chemical elements.Listed here are mainly average market prices for bulk trade of commodities. Data on elements' abundance in Earth's crust is added for comparison.

  7. 15 of the rarest items in the world - AOL

    www.aol.com/news/2017-08-01-15-of-the-rarest...

    In February 2007, the world's rarest baseball card sold at auction for $2.3 million. If you think that's totally wild, consider the world's rarest bible, which could net you $25 to $35 million.

  8. 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 ...

  9. The Most Expensive and Rarest Squishmallows Ever Sold

    www.aol.com/most-expensive-rarest-squishmallows...

    Today, the rarest Squishmallow ranges in price from $1,399 to roughly $2,000. 10 Most Expensive and Rarest Squishmallows Read on to find the rarest and most expensive Squishmallows and what makes ...