My dupe posts have been a bit low on the ground recently, sorry about that guys, sometimes they are just hard to come across, anywho I'm back today with what I think is a pretty good match. You can be the judge of that.
Both of these gorgeous polishes have the same turquoise and black, matte - paint splatter esk flecks, that are suspended in a clear nail polish base. They are identical! I know Formula X is only available in Sephora, so this fab dupe from Maybelline is a lot more readily available and is half the price.
As always I will keep my beady eyes out for more possible dupes, so until then..