mineral
Gossan with Pyrite
Iron oxide-hydroxide rich weathered matrix with FeS2
AI-generated identification · may be incorrectHardness varies from 5 to 6.5 for quartz and oxides; color ranges from rusty brown, red, to orange with metallic brassy flecks; luster is earthy to metallic; amorphous to microcrystalline structure.
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Physical properties
Hardness varies from 5 to 6.5 for quartz and oxides; color ranges from rusty brown, red, to orange with metallic brassy flecks; luster is earthy to metallic; amorphous to microcrystalline structure.
Formation & geological history
Formed through the surface weathering and oxidation of sulfide ore deposits, typically associated with hydrothermal veins.
Uses & applications
Used as an indicator mineral for subsurface copper, gold, and massive sulfide ore deposits by prospectors.
Geological facts
Gossans serve as classic geochemical pathfinders in mining exploration, often referred to as iron hats above ore bodies.
Field identification & locations
Identify in the field by its distinctive boxwork texture, porous brown iron-oxide crust, and high specific gravity.
