Paceite is a term used in mineralogy to refer to a rare uranyl carbonate mineral. The word is pronounced /peɪsʌɪt/ in IPA phonetic transcription, with the stress on the first syllable. Its spelling is derived from the Latin word "paces", which means step or pace, and the suffix "-ite", which indicates a mineral. The mineral was named after Richard W. Pace, an American mineralogist who first described and analyzed it in 1954. Paceite can be found primarily in the United States and Australia.