Perhaps this sample was a shoddy one in comparison to the others.
Sure, maybe. Or maybe it was genuine and was stolen. Or maybe Jesus turned it into petrified wood. I dunno. I only know that the geologists who have studied the Apollo lunar samples overwhelmingly agree that they are genuine. I would say 'unanimously agree,' but I'll leave open the possibility that there are some geologists who believe otherwise. I haven't yet found any of those, though.