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Minerals oxidized under ambient conditions

These minerals must be kept with oxygen absorber in a sealed container, sealing directly in resin, or soaking in oil.

• Antimony (Readily)
• Arsenic (Surface readily turns black)
• Arsenolamprite (Surface readily turns black)
• Lawrencite => Molysite
• Manganosite => Manganese dioxide (Readily)
• Parasymplesite => Ferrisymplesite (Turns dark color by Photo-oxidation)
• Pyrochroite => Feitknechtite (Readily)
• Symplesite => Ferrisymplesite (Turns dark color by Photo-oxidation)
• Vivianite => Metavivianite (Photo-oxidation, H2O2)