Linked from
The 7 pages that link to Oxidation zone, each with the reason it gives.
MalachiteRelated: Malachite commonly develops where copper sulfides weather in this zone.
Supergene enrichmentBroader topic: Oxidation releases metals that groundwater can carry downward.
AzuriteNarrower topic: Azurite forms in this zone as copper minerals react with oxidizing fluids.
CrocoiteNarrower topic: Crocoite forms where lead-bearing deposits undergo oxidation.
HemimorphiteRelated: Hemimorphite typically forms in this altered zone above primary zinc ores.