I have a map pack, which tells me four locations to get this type of Azulyte. Two are hostile, one is kind of a pain to run to and the other doesn't seem to exist in the game anymore.

The first two mentioned are on the Abandoned Island, and on Scorpion Island, on the mountain ranges.

The third is north of the Izzon Crest settlement, way off the beaten path.

The fourth is indicated to be in a "public" lair at 24454 / 21835, but when I go into that lair/cave there are two bends and a brick wall. No Azulyte to be seen, far as I can tell.

Am I missing something? Where should a hatchling go for Cerulean Azulyte?

Not that I really, REALLY need this yet... but I'm trying to do the lairshaping quest that requires it, and I could see this being an issue later.