metamorphic
Quartz-rich hydrothermal ore rock, likely gold-bearing quartz vein
Milky quartz (SiO₂) with iron-oxide staining and probable sulfide minerals; host rock may be schist or altered granite
AI-generated identification · may be incorrectWhite to gray, vitreous-to-waxy quartz with rusty orange-brown limonite/goethite and dark mica or sulfide inclusions; quartz hardness 7, no cleavage, conchoidal fracture, specific gravity about 2.65. Visible gold cannot be confirmed from the photograph.
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Physical properties
White to gray, vitreous-to-waxy quartz with rusty orange-brown limonite/goethite and dark mica or sulfide inclusions; quartz hardness 7, no cleavage, conchoidal fracture, specific gravity about 2.65. Visible gold cannot be confirmed from the photograph.
Formation & geological history
Formed when hot, mineral-rich fluids filled fractures and crystallized quartz, commonly during regional metamorphism or intrusive activity; age depends on locality, often Paleozoic to Mesozoic in exposed ore belts.
Uses & applications
Used primarily as a mineral specimen or prospecting sample; gold-bearing material may have economic value, while ordinary quartz vein rock has little industrial value.
Geological facts
Rusty staining indicates oxidation of iron-bearing minerals and can occur above sulfide ore, but it is not proof of gold. Assay or laboratory testing is required for precious-metal identification.
Field identification & locations
Common in quartz-vein districts worldwide, including California, Nevada, Australia, Canada, and Brazil. Look for glassy quartz, vein textures, sulfides, and heavy streaks; test suspected gold with density, hardness, and an assay rather than appearance alone.
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