Sparkle in mac pots genuine?

[underablanketofstars]

Is it normal for some "genuine" mac pots to have more glittery/sparkle in amidst the blackened grey than others or is this a sign of a fake?

 

[gildedangel]

Depends on the pot, what product is it?

 

[underablanketofstars]

My MAC Nylon shadow and All that Glitters shadow appear to have the same higher-concentration of sparkle.