50 of them are needed for an addon of the Citizen Outfits.
50 of them are needed to be able to trade Spider Silks for Spider Silk Yarns with Marina.
10 of them are needed during the Hot Cuisine Quest for making Sweet Mangonaise Elixir.
At least 1 is needed for the Barbarian Test Quest.
1 of them is needed for The Scatterbrained Sorcerer Quest.
1 of them is needed for The Cursed Crystal Quest.