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| The most reactive element in the periodic table. A pale yellow gas and the first of the halogens.
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Ampoule.
This small borosilicate glass ampoule originally contained a small amount of elemental fluorine. Whether it still does now is open to debate. The vessel was "passivated" by allowing fluorine gas to react with the walls and this can be seen as a milky discoloration that should help to protect the vessel from further attack. We have plans to upgrade this sample with something considerably better which should allow the pale yellow color of the gas to be seen.
Source: Leicester University
Size: 0.25"
Purity: Unknown
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Teflon thread seal tape.
Teflon is chemically similar to the hydrocarbon chains in oil and plastics and people, with the hydrogen atoms replaced by fluorine. While hydrocarbons are, by weight, mostly carbon, teflon is mostly fluorine by weight, because an atom of fluorine weighs about 19 times more than an atom of hydrogen. Because fluorine is so dangerous and difficult to store, and because teflon is about 75% fluorine by weight, it makes a good substitute for the real thing in element collections.
Source: Hardware store
Size: 2"
Purity: 75%
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Fluorite.
Fluorite or fluorspar is a very common mineral and is named after its fluorine content. It forms cubic crystals, often interpenetrant, and cleaves into perfect octahedra. Fluorite is subtranslucent to transparent with a vitreous lustre and is found in a wide variety of colors: colorless, white, yellow, green, blue, red, purple, pink, brown and black, sometimes more than one color within the same crystal. Fluorite is also noted for changes of color depending on whether light is passing through it or falling upon it. Some fluorites also exhibit a phenomenon known as daylight fluorescence, changing color and glowing under sunlight as opposed to artificial light.
Source: Mackay mineral collection
Size: 1.25"
Purity: 48%
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