Compositions in the pyroxene are Wo 39.77-45.89 En 40.98-48.39 Fs 11.48-14.55, which makes them cluster at the border between augite and diopside.
Kristöllun pýroxen steindanna er frekar einsleit (Wo 39,77-45,89 En 40,98-48,39 Fs 11,48-14,55), sem setur gerð steindanna við mörkin á milli augít og díopsíd.