Arsenic Minerals: Realgar, Arsenopyrite, Others
Realgar (red), Orpiment (yellow), and their pigment
Formulas:
Realgar: α-As4S4
Orpiment: As2S3
Interactive Rotation:
Photos by Nick Mann, from Theodore’s Gray 2014 book: “Molecules.”
Arsenopyrite
Formula: FeAsS
Interactive Rotation:
Photos by Nick Mann
