Iota Geminorum IV was the uninhabited fourth planet in its star system, and the homeworld of the tribble, as well as an abundance of reptiles, the latter keeping the former in check. (ENT: "The Breach")

Tribble desktop monitor

Iota Geminorum IV listed on an analysis of a tribble

Around stardate 1421.9, Starfleet scientist Edward Larkin genetically engineered sample specimens of tribbles from the planet. Larkin, who was later described as an idiot, believed them to be a suitable food source save for their very slow breeding rate, which he increased with disastrous consequences. (ST: "The Trouble with Edward")

Comparative Xenobiology

Listed as native planet of the tribbles

In 2369, a chart illustrating various creatures, including tribbles, from around the known galaxy was displayed in a classroom aboard Deep Space 9. (TOS: "The Trouble with Tribbles"; DS9: "The Nagus", okudagram)

The "comparative xenobiology" okudagram used the spelling "Geminorium", though it wasn't legible on screen.

In order to fulfill their self-given task to hunt the tribble species to extinction, a Klingon armada obliterated the tribbles' homeworld, and by the late 23rd century, the species was entirely eradicated. (DS9: "Trials and Tribble-ations")

According to Star Trek: Star Charts (p. 64) and Stellar Cartography: The Starfleet Reference Library ("Federation Historical Highlights, 2161-2385"), Tribble Prime (Iota Geminorum) was located in the Beta Quadrant. According to a map of the Klingon Empire – prepared by the Scribe K'Tark for the Klingon High Council in the Year of Kahless 893 (2366) – Tribble Prime was identified as a Klingon planet.

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