- For the liquid, please see magnasite.
In 2370, the Duras sisters and their associate Gorta illegally mined over ten thousand kilograms of magnesite from the Pakled-owned planet of Kalla III. The USS Enterprise-D tracked the magnesite to a Yridian buyer while the transaction was still taking place. Commander Riker purchased the Yridians' magnesite, and then beamed it into space and fired phasers on it to expose the Duras sisters' cloaked Bird-of-Prey. (TNG: "Firstborn")
A Federation hospital on Ajilon Prime was located near a large deposit of magnesite, preventing Julian Bashir and Jake Sisko from transporting to the surface in 2373. (DS9: "Nor the Battle to the Strong")
Magnesite can provide partial protection against antimatter radiation. After an antimatter accident, Brin's people in the Delta Quadrant hid in magnesite-rich caves and lined makeshift environmental suits with magnesite to survive the radiation. However, they still suffered from widespread radiation poisoning. (VOY: "Friendship One")
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