Sheen

Sheen is a variety of obsidian which has many minute, spangly inclusions, ranging in color from mahogany to silver and gold (the most valuable of these, gold sheen, is a semi-precious stone). Sheen is usually tumbled (if large and attractive) or cut cabochon, and can be polished to a glossy, gleaming finish. A typical specimen has a base value of 10gp.