Limestone

Limestone can be mined by a player with a Mining level of 1, and gives 26.5 Mining experience when mined. Limestone can be crafted into limestone bricks through the Crafting skill. It is required in the Regicide quest to make quicklime to make a barrel bomb. It's also used in Construction. Limestone can also be purchased from the builders/general store in Mort'ton for 10 coins. There are only two locations at which it can be mined:
 * the limestone quarry west of the temple Paterdomus and northeast of Varrock
 * the white rocks near the dire wolves in northeast Tirannwn between the walled city of Prifddinas and road in Arandar.

Examine text
For "Pile of Rock": For "Limestone":
 * Prospect - "This rock contains limestone."
 * Examine - "A pile of lime rock."
 * Examine - "Some limestone."