Answer: realgar

AnswerCrossword Clue
REALGARFireworks mineral
REALGARA shade of orange or yellow.
REALGARArsenic sulfide for pigments.
REALGAROrange-red mineral.
realgararsenic disulfide, As2S2, found in nature as an orange-red mineral and also produced artificially: used in pyrotechnics
realgara mineral, also ROSAKER