Where can you get armor stone in monster hunter 3rd?

In Monster Hunter Portable 3rd, you can obtain Armor Stone by mining in the Volcano area, specifically in the mining spots found there. Additionally, you can also receive Armor Stone as a reward for completing certain quests or by carving specific monsters, such as the Lagiacrus or the Nargacuga. Be sure to check the quest rewards and mining locations to maximize your chances of acquiring this valuable material.