You have struck Raw Adamantine! Praise the miners!
I received this message while digging out the commoners' quarters. And this after finding five aluminium clusters, a copper vein and a blackmetal vein (Dig Deeper, but with [TRAPAVAOID] removed), so I'm a happy man, with a reasonably rich fortress. Now, you should know that I normally don't mine out ores and gems from bedrooms, dining halls, offices, arenas... Understandably, I'll make an exception here (but only when I'm completely and utterly ready). And I'm only in the second year, with just 15 Dwarfs. Due to the Orcs I've only had one caravan. Because of a tantrum from one of the migrants (insufficient food and booze production from my behalf), my woodcutter/carpenter has also been bedridden with a broken head and leg for half a year. In the meantime, the magma's slowly but steadily making a way to my (inbuilt) forges. The engravers are smoothing what is going to be the dining hall, the mason is making Obsidian blocks, doors, thrones, tables, armour stands, weapon racks, coffers and cabinets. I'm also planning to make all of the noble housing heated. That's about it I think.
Oh, right. This is new Fortress, my Igloo-fort would crash at a certain time. No idea why.
EDIT: I might make a tribute to it, only in microcline. I'm not sure yet. I'll try and survive first.