The name of the metal was changed to avoid copyright mess, but it still frequently used in gameplay. The source of Tolkien's idea in the real world was most probably titanium, as this metal, while actually quite abundant as ore, was very expensive to produce in its metallic form (especially by medieval technology), and has some of mithril's properties of strength, bright silvery colour, corrosion resistance and light weight. Yet usually in D&D campaign settings mithral is given more magical role (and can even co-exist with titanium itself).
|Type of mithral item||Item cost modifier|
|Light armor||+1000 gp|
|Medium armor||+4000 gp|
|Heavy armor||+9000 gp|
|Other items||+500 gp/lb.|