Crucial = Micron
Micron =/= Crucial.
When you see "Micron" from those unreliable online mail order or small computer store or computer show,
they're 3rd party made stick, using unknown pcb, made by unknown factory, just using Micron chips.
Real Micron stick has MT sticker, good looking pcb, spd chip for sure.
Newegg is selling such real Micron stick. You can also find such real Micron stick in Dell's.
Crucial stick is real Micron stick with additional CT sticker, Crucial is Micron's direct sale to end-users.
However, sometimes ago some users reported that Crucial 512M ddr is using Samsung chips.