Correct spelling for the English word "sardachates" is [sˈɑːdɐt͡ʃˌe͡ɪts], [sˈɑːdɐtʃˌeɪts], [s_ˈɑː_d_ɐ_tʃ_ˌeɪ_t_s] (IPA phonetic alphabet).
A name given by the ancients to varieties of agate, partaking of the nature of cornelian, or which contained layers of sard or cornelian; the flesh-coloured agate when clouded and spotted.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.