Board Thread:Suggestions forum/@comment-34204318-20180322053453/@comment-33185350-20180322150752

High King Ithilion wrote: If it's going to be obsidian, obsidian needs to be made indestructible and have a stair, slab, and wall variant. Not to mention, irl obsidian is actually highly brittle. Overall I'd say a unique stone type is better.

Ithilion, Discussions Moderator (Auta i lómë) Yes, irl obsidian is not a good building material at all. I was pointing out, however, that the somewhat fictional stone in Minecraft that the game calls obsidian is actually quite like the stone described in the books.

A stair, wall and slab variant would be cool for builds in general. Obsidian is already practically indestructible to NPCs as far as I know - it’s just that players can mine through it.

Another stone type would also be reasonable. Should it be impossible for players to mine through though? If it’s not obsidian then it also shouldn’t be craftable in my opinion.

Also, I wouldn’t think this stone (obsidian or otherwise) would spawn in large settlements - only Minas Tirith and Orthanc. It’s obviously a forgotten craft of Númenor that the people of Gondor wouldn’t have been able to replicate, and such a powerful craft that it would only be used in special places. It would degrade the stone’s value to have it found across the countryside in regular old towns (even if they are exceptionally large).