Mazahua is a tonal language and distinguishes high, low, and falling tones on all syllables except the final syllable of a word, on which the word stress falls predictably.
Mazahua's most distinctive feature is its abnormally large phoneme inventory, which totals around sixty phonemes, or twice the number in English. There are eight vowel phonemes, seven contrastive nasal vowels, and as many as forty-five consonants.
Amongst these are ejectives, implosives and contrastive voicelesssonorants. Along with Sindhi and Tukang Besi, Mazahua is a rare case of a language with true implosives far isolated from regions where implosives are commonly encountered. It is also one of the few languages with ejective fricatives.
Knapp Ring, Michael Herbert, Fonología del mazahua, Tesis de licenciatura, ENAH, México, 1996
Michael Knapp, 2002 “Elementos de dialectología Mazahua" In Del Cora Al Maya Yucateco: Estudios Linguisticos Sobre Algunas Lenguas Indigenas Mexicanas Paulette Levy (Ed.), Universidad Nacional Autonoma De Mexico