Unique 'moon mineral' brought back by Apollo astronauts is found in Australian rocks | Mail Online: "Australian paleontologist Birger Rasmussen has found tranquillityite, a mineral thought to be unique to the moon, in billion-year-old rocks in Western Australia.
When the Apollo astronauts returned to Earth, they brought back three minerals - armalcolite, pyroxferroite, and tranquillityite, named after the Sea of Tranquillity, where astronauts landed in 1969.
The first two were subsequently found on Earth - but the third, tranquillityite was thought to be the 'moon's own mineral'."
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