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  2. Hierarchy of precious substances - Wikipedia

    en.wikipedia.org/wiki/Hierarchy_of_precious...

    The measurement of sales of popular music starts high relative to the wedding anniversary scale, concentrating on gold and platinum (see gold album).Likewise, credit card companies usually have a "gold card" and a "platinum card" (many formerly had a "silver card" then followed by a "gold card", but due to similarity in appearance between silver and platinum these were often discontinued with ...

  3. Beryl - Wikipedia

    en.wikipedia.org/wiki/Beryl

    The word beryl – Middle English: beril – is borrowed, via Old French: beryl and Latin: beryllus, from Ancient Greek βήρυλλος bḗryllos, which referred to a 'precious blue-green color-of-sea-water stone'; [2] from Prakrit veruḷiya, veḷuriya 'beryl' [8] [a] which is ultimately of Dravidian origin, maybe from the name of Belur or ...

  4. Noble metal - Wikipedia

    en.wikipedia.org/wiki/Noble_metal

    Gold, Platinum, Silver, and a few rare metals. The members of this class have little or no tendency to unite with oxygen in the free state, and when placed in water at a red heat do not alter its composition. The oxides are readily decomposed by heat in consequence of the feeble affinity between the metal and oxygen." [29]

  5. List of named alloys - Wikipedia

    en.wikipedia.org/wiki/List_of_named_alloys

    Most iron alloys are steels, with carbon as a major alloying element.. Elinvar (nickel, chromium); Fernico (nickel, cobalt); Ferroalloys (Category:Ferroalloys) . Ferroboron ...

  6. Benchmade - Wikipedia

    en.wikipedia.org/wiki/Benchmade

    The next class is the Black Class, also known as the Professional class. This type of Benchmade knife is made for military, law enforcement, and public safety workers. The last class is the Gold class, also known as the Collector class. This class of Benchmade knife is made for collectors and are limited edition. [12]

  7. Pyrite - Wikipedia

    en.wikipedia.org/wiki/Pyrite

    The mineral pyrite (/ ˈ p aɪ r aɪ t / PY-ryte), [6] or iron pyrite, also known as fool's gold, is an iron sulfide with the chemical formula Fe S 2 (iron (II) disulfide). Pyrite is the most abundant sulfide mineral .

  8. Why is it called Black Friday? Here's the real history behind ...

    www.aol.com/news/why-called-black-friday-heres...

    According to the History Channel, the name was first used to describe an 1869 financial crisis, in which corruption and stock fraud caused the U.S. gold market to collapse entirely.

  9. Black gold - Wikipedia

    en.wikipedia.org/wiki/Black_Gold

    Black Gold (Nina Simone album), 1970; Black Gold (Kutt Calhoun album), 2013; Black Gold: The Best of Soul Asylum; Black Gold: Best of Editors "Black Gold" (song), a 1993 song by Soul Asylum from Grave Dancer's Union "Black Gold", a 1997 song by Millencolin from For Monkeys "Black Gold", a 2005 song by Running Wild from Rogues en Vogue