Metamorphic/Igneous (Hydrothermal)
Gold Ore in Quartz/Schist
Auriferous Quartz and Sulfide-bearing Schist
Hardness: 6-7 (quartz) vs 1-2 (schist/micas), Color: Grey, yellowish-brown, and rust-orange (iron staining), Luster: Dull to vitreous, Crystal Structure: Massive quartz with foliated metamorphic matrix, Cleavage: Poor in quartz; excellent in mica components.
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Physical properties
Hardness: 6-7 (quartz) vs 1-2 (schist/micas), Color: Grey, yellowish-brown, and rust-orange (iron staining), Luster: Dull to vitreous, Crystal Structure: Massive quartz with foliated metamorphic matrix, Cleavage: Poor in quartz; excellent in mica components.
Formation & geological history
Formed through hydrothermal processes where hot, mineral-rich fluids circulate through fractures in the earth's crust, often in metamorphic belts or near volcanic activity during orogenic (mountain-building) events.
Uses & applications
Primary source for commercial gold extraction; lower grade specimens are used for mineral collecting and landscape decoration.
Geological facts
The rusty orange color is often due to the oxidation of pyrite (fools gold), which is a common indicator mineral for actual native gold in geological veins.
Field identification & locations
Identify in the field by looking for heavy iron staining (gossan) on quartz or schist rocks. Often found in historic mining districts, stream beds, or contact zones between different rock layers.
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