Rare Moon Mineral Found On Earth

sciencehabit writes "A mineral previously known only from moon rocks and lunar meteorites has now been found on Earth. Researchers discovered the substance — dubbed tranquillityite after the Sea of Tranquility, where Apollo 11 astronauts landed on the Moon in July 1969— at six sites in Western Australia (abstract). The mineral occurs only in minuscule amounts and has no economic value, but scientists say it could be used for age-dating the rocks in which it occurs."

Comments

Collision?

[Janek Kozicki]

I wonder if this has anything to do with the theory that Moon was created due to a big collision of Earth with some other celestial body. This theory however is supported by reasoning that in general Moon and Earth have roughly similar composition. Then why tranquillityite is mostly on the Moon, and not Earth. Maybe the general geographical location of this material on Earth (Australia, you say?) would help in reconstructing the collision event, or maybe would lead to conclusion that the collision theory was wrong. Whatever the outcome, we are going to learn something.

Re:Collision?

[polymeris]

This is just conjecture, but TFA says Tranquilliyite metamorphes readly to other minerals. The moon, not having plate tectonics, lacks a major source of metamorphism, hence is more likely to keep those minerals in their igneous state.
On the earth, OTOH, by both a lot of metamorphic (tectonics, vulcanism,...) and sedimentary (wind, water, ice,...) agents, the rare Tranquillityite that formed was swiftly converted to other minerals.

As said, this is all just a guess. May be completely wrong.