Where were the minerals 'Pyroxferroite', 'Armalcolite' and 'Tranquillityite' first discovered in 1969 and 1971?
Armalcolite Armalcolite Armalcolite () is a titanium-rich mineral with the chemical formula (Mg,Fe)TiO. It was first found at Tranquility Base on the Moon in 1969 and is named for "Arm"strong, "Al"drin and "Col"lins, the three Apollo 11 astronauts. Together with tranquillityite and pyroxferroite, it is one of three new minerals that were discovered on the Moon. Armalcolite was later identified at various locations on Earth and has been synthesized in the laboratory. Tranquillityite and pyroxferroite were also later found at various locations on earth with tranquillityite being the last mineral brought from the Moon which was thought to be unique, with
Pyroxferroite "ferrum" (Latin for iron), as the iron-rich analogue of pyroxmangite. The word pyroxene, in turn comes from the Greek words for "fire" (πυρ) and "stranger" (ξένος). Pyroxenes were named this way because of their presence in volcanic lavas, where they are sometimes seen as crystals embedded in volcanic glass; it was assumed they were impurities in the glass, hence the name "fire strangers". However, they are simply early-forming minerals that crystallized before the lava erupted. Pyroxferroite was first discovered in 1969 in lunar rock samples from the Sea of Tranquility during the Apollo missions. Together with armalcolite and tranquillityite, it