Wroshite

Wroshite was a hard, flinty crystal the color of gun-steel that could be found on the arboreal planet of Kashyyyk. Wroshir deposits formed underground, under the roots of wroshyr trees, attracting fungus that fed on those deposits. Therefore, in order to obtain wroshite, it was necessary to mine the fungal nodes that clung to the tree roots.

Text and facts from the “Wroshite” article on Wookieepedia, licensed under CC BY-SA 3.0. Modified for this site.