D&D 3.0: Tales from Mystara
Alfmyr boasts the largest vein of soul crystals of any of the cities of the shadow elves. Mining these crystals is tedious, exacting work – it can take several years to extract a single crystal— but is considered rewarding by the elves because of the religious significance of the crystals. The crystals, of course, are not traded with other clans, but are shared between shamans, who are considered clanless, belonging to all of the shadow elves.
Alfmyr does profit financially from its mining, though, often finding precious metals near the pockets of soul crystals. The smoke of smithies can be smelled in Alfmyr, as these metals are fashioned into fine armor and weapons.
Geographically speaking, Alfmyr is the city farthest from the rest of the shadow elves, being located almost directly under the Canolbarth Forest in the Kingdom of Alfheim.