A Tallonian crystal.
Tallonian crystals are precious gemstones from the Tallonian homeworld.
They are illegal anywhere but on the Tallonian homeworld. To determine the purity of Tallonian crystals, a type 4 Tallonian microscanner is needed.
Quark tried to purchase Tallonian crystals from Regana Tosh but was apprehended by Odo. (DS9: "Hippocratic Oath")
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