Pestle and mortar

A Pestle and mortar is an item that is used to crush items into fine powder. It is used mainly in Herblore, though it is used in many quests as well. It can be bought from Herbalists. It can be used to grind several items in order to produce a dust. It is used with the following:
 * Unicorn horn-produces Unicorn horn dust which is used in Anti-poison potions.
 * Silver-produces Silver dust, an ingredient in the Guthix balance potion which plays a part in the In Aid of the Myreque Quest.
 * Chocolate bar-produces Chocolate dust, used in Energy potions and Chef's delight brew.
 * Kebbit teeth-produces Ground kebbit teeth for use in the Hunting potion
 * Gorak claws-produces Crushed gorak claws, used in A Fairy Tale Part II Quest and making Magic essence potion.
 * Bird's nest-produces a Crushed bird's nest which is used in Saradomin brew
 * Desert goat horn-produces Goat horn dust for use in Combat potions
 * Sq'irk-produces Sq'irk juice when crushed into a Beer glass during the Sorceress's Garden minigame.
 * Charcoal-produces Ground charcoal used in Digsite Quest.
 * Rune shards-makes Rune dust in Garden of Tranquility.

found in the Sorceress's Garden minigame. Five are required for a winter drink, four for a spring drink, three for an autumn drink, and two for a summer drink. These drinks maybe be used to temporarily boost Thieving level and energy, or may be turned in to Osman in Al Kharid for thieving experience.