Traces of tranquillityite are typically tiny – about 150 micrometers long, or less than the diameter of the thickest human hair. It is reddish-brown and mostly consists of iron, silicon, oxygen, zirconium, titanium and the rare earth element, yttrium.
In an article in Geology titled “Tranquillityite: The last lunar mineral comes down to Earth”, Professor Rasmussen and his colleagues report that the substance was found in six dikes and sills in Western Australia.
“Examination of dolerite from Western Australia suggests that tranquillityite is a relatively widespread, albeit volumetrically minor, accessory mineral,” they write.
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