“It's made of a stone called duskitine, which is neither rare nor valuable. But it does react to starlight, which may be a clue to its purpose.”
—Mr. Forkle, in Lodestar
Duskitine is a stone that reacts to starlight but is neither rare nor valuable. A disk made of duskitine was found in Keefe's cloak, which he gave to Sophie for protection while destroying part of Foxfire. Part of the Lodestar symbol was carved on it.