tranquillityiteとは 意味・読み方・使い方

Tranquillityite is silicate mineral with an average formula (Fe²⁺,Ca)₈(Zr,Y)₂Ti₃ (SiO₄)₃O₄. It is mostly composed of iron, oxygen, silicon, zirconium and titanium with smaller fractions of yttrium and calcium. It is named after the Mare Tranquillitatis (Sea of Tranquility), the place on the Moon where it was found during the Apollo 11 and 12 missions in 1969. It was identified in 1971 and later found in lunar rocks from all Apollo missions. Together with armalcolite and pyroxferroite, it is one of the three minerals which were discovered on the Moon. Fragments of tranquillityite were later found in Northwest Africa, in the NWA 856 Martian meteorite.