This mod is very similar to Darklocq's Sufficient Adamantium mod, except his requires OpenMW and this one is for the regular version of the game. Also, my mod works slightly different from his.

Basically, in vanilla Morrowind (or rather vanilla Tribunal) Adamantium Ore is exceedingly rare. Each Raw Adamantium rock has a maximum of one piece of ore, with a 40% chance of being completely empty. Adamantium Ore also does not respawn, so any rock that's emptied will stay emptied forever. This means in order to get a full set of adamantium armor (without resorting to murdering someone who has a set, anyway), you'd have to keep re-loading the cells in which Raw Adamantium spawns in until absolutely each one has a piece, as there's 20 rocks in the game and you need exactly 20 pieces of ore to craft the greaves and pauldrons (these are the only pieces you can't find laying around or for sale somewhere in the Tribunal worldspaces).

With this mod, every Raw Adamantium rock is guaranteed to have at least 2 pieces of Adamantium Ore. Some are guaranteed to have 3, and others may have up to 4. This means even at the bare minimum amount, if you visit every Raw Adamantium rock in the game, you'll be guaranteed to be able to craft yourself at least one full set of Adamantium Armor.

I recommend using this alongside my Improved Armor Rating for DLC Medium Armors mod, which improves the armor rating of a few medium armor sets including Adamantium Armor. (in vanilla, Adamantium is hardly even worth the hassle to obtain as it's still worse than Glass Armor and in fact even worse than Indoril Armor in terms of armor rating).

Requires Tribunal