Obsidian

Obsidian, also called natural glass or volcanic glass, was a hard, glossy, and black ornamental stone.

Description
The stones were often chipped into daggers and arrowheads, but the finer grades of stone were usually polished and smoothed to remove sharp edges. Obsidian was often carved into figurines, including the magical obsidian steed. Low quality obsidian was called pitchstone and had a rougher surface, a dull appearance, and a lower price. A typical stone had a base value of 10 gp.

Notable obsidian types

 * Blacksmoke obsidian: This form of the stone was often found and sold in Tashalan bazaars.