Fiber, I have noticed that the LCD plating is virtually impossible to distinguish from bare aluminum. The first time I took a part out, I thought it had failed completely until I saw it soaking up dye.
As far as hardness goes, here's my thoughts, although they may be completely wrong. Isnt' the anodized layer Aluminum oxide, or Al2O3? My assumption is that the Al2O3's hardness is roughly constant, and you are actually only changing the thickness and density of the Al2O3 layer when you change your anodizing parameters. How far off does this sound?
Edit: spelling and grammar.
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