siarczk
Siarczk is not an established or widely used term in Polish scientific vocabulary. In standard Polish, related words include siarka (sulfur), siarczek (a sulfide), siarczan (a sulfate), and siarczkowy (sulfidic or sulfur-containing). When the sequence “siarczk” appears in texts, it is usually a mistaken form or a truncation of a longer word such as siarczek or siarczkowy.
Etymology and usage context suggest that siarczk would be derived from siarka with a derivational suffix, but
In geology and mineralogy, the related concept is sulfide minerals, referred to in Polish as minerały siarczkowe.
If siarczk appears in a text, it is advisable to check whether it is a typographical error