Definition of armalcolite in English:

armalcolite

noun

Mineralogy
  • A dark grey, titanium-rich mineral discovered in lunar rock samples and subsequently found (though rarely) in terrestrial rocks.

Origin

1970s. From the names of the three U.S. astronauts, Neil Armstrong, Edwin Aldrin (b. 1930), and Michael Collins (b. 1930), who brought the first rock samples from the moon in 1969 + -ite.

Pronunciation

armalcolite

/ɑːˈmalkəlʌɪt/