Holna IV

From Memory Alpha, the free Star Trek reference.

Holna IV is a planet in the Alpha Quadrant that possesses large quantities of mizainite.

During the war, the planet was captured by the Dominion. In Damar and Weyoun's proposed changes to the Federation-Cardassian border in 2374, Holna IV would have ended up in Federation hands. Lauren once said that the mizainite could have kept the Dominion's shipyards running for years, but the Dominion were willing to cede it to the Federation in order to get control of the Kabrel system. (DS9: "Statistical Probabilities")

Holna IV probably remained in Dominion hands, as the Federation discovered that the Dominion wanted the Kabrel system to extract the tri-nucleic fungus from Kabrel I to manufacture more ketracel-white.