Soul Stone

Sell value
30 Gold

What drops it

 * Shiro'ken

Common crafting materials

 * 3-4 Granite Slabs

Rare crafting materials

 * 1 Lump of Charcoal

Testing
In testing using a Superior Salvage Kit about 12% yielded 1 charcoal, the rest yielded an average of about 3.7 Granite Slabs each. When the value of Granite Slabs is over about 8g each, it may be profitable to salvage these.