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Quick answer：Realgar is a bright red mineral, primarily composed of the硫化砷 (arsenic sulfide) compound. It has been used historically in traditional Chinese medicine and as a pigment. Its chemical formula is As4S4.
Quick answer：Realgar is a bright red mineral, primarily composed of the硫化砷 (arsenic sulfide) compound. It has been used historically in traditional Chinese medicine and as a pigment. Its chemical formula is As4S4.