The spelling of the word "Sassoline" can be explained using IPA phonetic transcription. The initial "s" is pronounced as the voiceless alveolar fricative /s/. The following "a" is pronounced as the short vowel /æ/. The double "s" is pronounced with two separate /s/ sounds. The "o" is pronounced as the short vowal /ɒ/. Finally, the final "line" is pronounced as the diphthong /laɪn/. Therefore, the correct IPA transcription of "Sassoline" is /sæsəlɑɪn/.
In min., a term for boracic acid, which occurs in thin, scaly, irregular, six-sided crystals, of a whitish colour, pearly lustre, and less or more translucent, found with various impurities in many volcanic regions.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.