I tried dissolving my beryllium lump. Placement in 5% acetic acid resulted in no reaction. In this regard beryllium (and its protective layer) are very similar to aluminium. Placement in concentrated hydrochloric acid, however, resulted in a vigorous reaction. The surface coating was etched and the unique crystal structure of the beryllium is visible. The beryllium is $18.00, so any significant period of dissolution for no purpose is a waste of money. I plan to make some beryllium hydroxide paste in the future, however. The peculiar sheen and darkness of the beryllium after dissolution is not captured well on camera, yet here are some pictures of it.