Yvonite is a rare mineral that has the chemical composition of (Fe2+,Mg,Al)2(PO4)(OH)2·8H2O. The spelling of yvonite follows the standard English orthography rules. The word is spelled as /aɪvənaɪt/, with the first syllable pronounced as "eye" and the second syllable pronounced as "vuh". The final syllable is pronounced as "nait" with a long "a" sound. The word yvonite is named after the French mineralogist, Yvon Lachance, who discovered it in 1982.