The mines of Baator's first Layer, Avernus, produce a black-hued ore called arjale. If alloyed with iron, it becomes a light green-grey the color of the skies of Dis. This alloy is dajavva, more commonly known simply as green steel.
Lighter than normal steel, darjavva can be processed into razor-fine edges, making green steel weapons both faster and more damaging than their standard counterparts. Green steel is not magical.
Sources
Dragon Magazine #91 (as arjale and dajavva)
Planewalker's Handbook (as green steel)
Arms & Equipment Guide (D&D 3.0)
Fiendish Codex II: Tyrants of the Nine Hells
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