Where does “feldspat” come from?
feldspat (Icelandic) comes from German feldspat, from German spät, from Middle High German spǣte, from Old High German spāti, from Proto-West Germanic *spādī, from Proto-Germanic spēdiz, from Proto-Indo-European speh₁-tí-s, from Proto-Indo-European speh₁- — to succeed, to prosper.
feldspat (Icelandic): feldspar
Ancestry of “feldspat”, step by step