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Topaline is a rare mineral which is used in life support systems, and has been known to disrupt sensors.

In the 22nd and 23rd centuries, topaline was a highly-prized mineral by the Klingon Empire and the acquisition of the mineral led to several tense engagements with the United Federation of Planets, including Capella IV. (TOS episode: "Friday's Child"; TOS novel: First Strike)

The planet taD, conquered by the Empire in the mid 22nd century, was a key source of topaline. After the 2220s, however, the Klingons had discovered dozens of worlds rich in topaline, lessening taD's importance.(TNG novel: Diplomatic Implausibility)

In 2267, the United Federation of Planets main source of topaline on Altimara was running out, and Capella IV was viewed as the best replacement source. (TOS novelization: Friday's Child)

In 2355, the planets and moons of the Maxia Zeta star system were discovered be richly endowed with many minerals including topaline. (TNG novel: The Buried Age)

Trinni/ek, a planet discovered in 2380 by the USS Io, had large supplies of topaline and other minerals. (ST novel: Articles of the Federation)

In the wake of the Borg Invasion of 2381, there was an increased demand for topaline for refugee habitats. (ST novel: A Singular Destiny)

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