I looked at my accessory and it says without a doubt 'manufacted nethicite'. The game also spells magic as 'magick' (which is technically acceptable) and technique as 'technick' (which annoys the hell out of me).
It must be part of the localization style, then. I think that Magick, Technicks, and other naming conventions were only added to make them seem more than they were. Magic and Technique look a lot less interesting than Magick and Technick.