Scientists believed that the lunar minerals that the Apollo 11 crew brought to Earth in 1969 were the first such substance on our planet, but a unique discovery by geologists made in Australia refutes this. In Australia, as it turned out, there are whole deposits of minerals that were believed to be found only on the moon.
We are talking about tranquility - a mineral that could not be detected in terrestrial conditions until recently. Existing samples of this rare mineral were brought to Earth by American astronauts, who, by the way, found a number of compounds that do not exist on our planet on the Moon, for example, titanium-containing armalcolite and silicate pyroxferroite.
True, taking into account the fact that tranquility was still found in Australia, the listed substances may also lurk somewhere on our planet, awaiting their discovery.
Tranquilitite owes its name to the Sea of Tranquility (Mare Tranquillitatis), where it was found by the ship Apollo 11 that landed there in 1969. The mineral is a structure of microscopic needles, so it is extremely fragile.
Kolesnikov Andrey