The Alnathian jewel was a green crystal native to the planet Alnath II. The jewel was discovered in 2268 by the crew of the USS Enterprise, and was found inside the Alnathian pyramid. An investigation of the crystal revealed it was quasi-organic and contained an immense level of internal energy. This energy was acting on the crews of the Enterprise and the IKS Terror and making them lazy, unreliable, and in the Klingon's case, mutinous. To stop the affect, Captain James T. Kirk ordered the jewel placed inside a rodinium box and had it encased in a force field. (TOS novel: The Klingon Gambit)

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