Sinnerite is a mineral named after the Canadian geologist Benjamin Silliman, Jr. Its chemical formula is Ca6[(AsO4)2(PO4)2](CO3)(OH)2·3H2O. The pronunciation of sinnerite is /ˈsɪnəraɪt/. The spelling of sinnerite uses the double consonants "nn" to indicate that the vowel before it is short, and the final "e" to indicate that the preceding vowel sound is long. The phonetic transcription of sinnerite highlights the emphasis on the second syllable, with the "e" being pronounced as "eh" and the "i" as "ih".