Rough Stone

Rough Stone can be found while mining and is used in Blacksmithing, Engineering and Jewelcrafting.

Source
Found in copper veins.

Rough stone as an Ingredient
Rough Stone is used in the following recipes:

Blacksmithing

 * Rough Grinding Stone
 * Rough Sharpening Stone
 * Rough Weightstone

Engineering

 * Rough Blasting Powder

Jewelcrafting

 * Rough Stone Statue