A topaline ore cave

Topaline was a rare mineral critical to the function of life support systems for planetoid colonies in the 23rd century. Naturally-occurring, topaline also had sensor-disrupting properties.

In 2153, while evading Xindi-Reptilian seekers, Captain Archer, Lieutenant Reed, Major Hayes, and the Xindi-Arboreal Gralik Durr took refuge in a cave containing topaline ore, through which the seekers could not scan. (ENT: "The Shipment")

In 2267, Captain Kirk attempted to secure topaline mining rights on Capella IV, competing with Klingon interests on the planet. The mineral was present in abundance. (TOS: "Friday's Child")

According to the Starfleet Medical Reference Manual, (p.19) the element topaline, symbol To, atomic weight 306, atomic number 117, was first discovered by Humans on the moon Ganymede in 2021.
Friday's Child's novelization indicated that the Federation had previously sourced topaline from Altimara (β) before deposits ran out.

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