There are two lens terms that have similar sounding (and potentially confusing) names: fluorine and fluorite. Apparently quite a few people have trouble distinguishing between the two, so here's a quick look at what they each are.
If you were impressed by Nikon's demonstration of its fluorine lens coating (re-embedded below for your viewing pleasure) then you'll be happy to hear this bit of rumor news from Nikon Rumors.
Most lenses nowadays come with a multipurpose chemical coating, meant to not only protect the lens a bit more from accidental scratches, but to also reduce reflections and aberrations and provide a clearer image. How the coating actually works might be a mystery to many of us though.