mineral/hydrothermal
Quartz-bearing Ore (likely Gold-bearing Quartz)
Quartz (SiO2) with potential sulfide mineralization (Pyrite/Arsenopyrite)
Hardness: 7 (Quartz component); Color: Milky white, gray, with yellowish/brownish iron oxide stains; Luster: Vitreous to dull; Crystal structure: Trigonal (hexagonal prisms)
- Hardness
- 7 (Quartz component)
- Color
- Milky white, gray, with yellowish/brownish iron oxide stains
- Luster
- Vitreous to dull
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Physical properties
Hardness: 7 (Quartz component); Color: Milky white, gray, with yellowish/brownish iron oxide stains; Luster: Vitreous to dull; Crystal structure: Trigonal (hexagonal prisms)
Formation & geological history
Formed in hydrothermal veins where hot, mineral-rich fluids circulate through crustal fractures. Often associated with orogenic gold deposits or magmatic intrusions.
Uses & applications
Primarily mined for gold extraction if metal content is high. Also used as silica source or collector specimens.
Geological facts
Quartz is the most common host rock for gold. The yellow staining often suggests the oxidation of iron-bearing minerals which frequently occur alongside precious metals.
Field identification & locations
Field identification involves checking for high hardness (scratches glass), presence of 'vuggy' or 'rusty' cavities (sulfide oxidation), and heavy specific gravity if metallic ores are present. Commonly found in mountainous or volcanic regions.
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