Trifluorine is a transperiodic chemical element that was known to Federation science by the 23rd century.
In the year 2266, Edward Fisher theorized that a transperiodic ore deposit was responsible for the unusually large number of starship crashes on Tlaoli IV, citing dilithium and trifluorine as examples of such a material. (TOS - The Janus Gate novel: Present Tense)
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