Eridanite is a type of material that can be found on planet Vulcan.
Eridanite was utilized by the Vulcan civilization as a refined material used by artisans. Eridanite pins were used by Vulcan craftspeople in attaching strings to music instruments such as the lyrette. (ST reference: Star Fleet Technical Manual)
- This material is presumably named for the Eridanus constellation, where the Vulcan system is situated.