Strange stuff in my aluminum stockpot

I bought a 40qt aluminum stockpot last weekend to finally give BIAB a try. I managed to get 8 gallons to a boil with the lid on. I then let it cool on the stove and the next day I opened the lid and there is now some strange stuff all over the sides. Cloudy little 'growths' speckle the sides of the kettle below the water line. This was actually the third time I boiled water in it (to build an oxide layer). Any idea as to what this is?

Full size: http://i.imgur.com/QbvpB.jpg

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It's looking very likely that it's mineral crystallization. No barnacles

As for the oven, this thing is way too big! My gas stove can barely get it to a boil across two burners. Looks like I wont be able to do full volume batches (5~ gallons into the fermentor). I'll post that as a separate topic though

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