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  2. Fluorite - Wikipedia

    en.wikipedia.org/wiki/Fluorite

    Ceramic grade fluorite (85–95% CaF 2) is used in the manufacture of opalescent glass, enamels, and cooking utensils. The highest grade, "acid grade fluorite" (97% or more CaF 2), accounts for about 95% of fluorite consumption in the US where it is used to make hydrogen fluoride and hydrofluoric acid by reacting the fluorite with sulfuric acid ...

  3. Plants vs. Zombies 2 - Wikipedia

    en.wikipedia.org/wiki/Plants_vs._Zombies_2

    Plants vs. Zombies 2 is a free-to-play [1] tower defense game where players defend the left side of the screen from hordes of zombies approaching from the right. [2] The player uses various plants with different abilities to combat these zombies. [3] Some plants attack zombies directly while others are designed to slow them down, allowing the ...

  4. Plants vs. Zombies - Wikipedia

    en.wikipedia.org/wiki/Plants_vs._Zombies

    Plants vs. Zombies is a video game franchise developed by PopCap Games, a subsidiary of Electronic Arts (EA). The series follows the affiliates of David "Crazy Dave" Blazing as they use his plants to defend against a zombie invasion, led by Dr. Edgar George Zomboss.

  5. Plants vs. Zombies (video game) - Wikipedia

    en.wikipedia.org/wiki/Plants_vs._Zombies_(video...

    Plants vs. Zombies Adventures, a spin-off and social game, was released for Facebook on May 20, 2011, [154] and closed on October 12, 2014. [155] A mainline sequel named Plants vs. Zombies 2 was released for iOS on August 14, 2013. [156]

  6. Fluoride - Wikipedia

    en.wikipedia.org/wiki/Fluoride

    The main uses of fluoride, in terms of volume, are in the production of cryolite, Na 3 AlF 6. It is used in aluminium smelting. Formerly, it was mined, but now it is derived from hydrogen fluoride. Fluorite is used on a large scale to separate slag in steel-making. Mined fluorite (CaF 2) is a commodity chemical used in steel-making.

  7. Yttrocerite - Wikipedia

    en.wikipedia.org/wiki/Yttrocerite

    Yttrocerite is a variety of the mineral fluorite with a chemical formula Ca F 2 +(Y,Ce)F 3. It is bluish red with isometric crystals and is named for the yttrium and cerium it contains. It has a Mohs hardness of 4–5. It has been found in Sweden, several states in the United States and Norway.

  8. Hydrogen fluoride - Wikipedia

    en.wikipedia.org/wiki/Hydrogen_fluoride

    Hydrogen fluoride is typically produced by the reaction between sulfuric acid and pure grades of the mineral fluorite: [14] CaF 2 + H 2 SO 4 → 2 HF + CaSO 4. About 20% of manufactured HF is a byproduct of fertilizer production, which generates hexafluorosilicic acid. This acid can be degraded to release HF thermally and by hydrolysis: H 2 SiF ...

  9. Fluorine - Wikipedia

    en.wikipedia.org/wiki/Fluorine

    Fluorite, the primary mineral source of fluorine, which gave the element its name, was first described in 1529; as it was added to metal ores to lower their melting points for smelting, the Latin verb fluo meaning ' to flow ' gave the mineral its name. Proposed as an element in 1810, fluorine proved difficult and dangerous to separate from its ...