mineral
Native gold-bearing quartz vein specimen
Native gold (Au) in quartz, with possible iron-oxide and sulfide minerals
AI-generated identification · may be incorrectIrregular gray-white quartz matrix with bright yellow metallic patches and dark weathered zones; gold is soft (Mohs 2.5–3), extremely dense (specific gravity 19.3), malleable, and has a metallic luster, while quartz is Mohs 7 with vitreous luster. The image alone cannot confirm that the yellow material is gold;…
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Physical properties
Irregular gray-white quartz matrix with bright yellow metallic patches and dark weathered zones; gold is soft (Mohs 2.5–3), extremely dense (specific gravity 19.3), malleable, and has a metallic luster, while quartz is Mohs 7 with vitreous luster. The image alone cannot confirm that the yellow material is gold; pyrite or mica are possible look-alikes.
Formation & geological history
Likely formed in a hydrothermal quartz vein when hot, mineral-rich fluids deposited silica and metals in fractures, commonly during mountain-building. Exact geological age and locality cannot be determined visually.
Uses & applications
Gold is valuable for jewelry, electronics, and investment; quartz specimens are collected. A genuine gold-bearing hand specimen may command substantially more than ordinary quartz.
Geological facts
Gold will deform or smear under a sharp steel point, whereas pyrite typically crumbles or powders; gold also leaves a yellow streak, while pyrite leaves a dark greenish-black streak. Avoid destructive testing until provenance is established.
Field identification & locations
Common in lode deposits worldwide, including Australia, Canada, the United States, South Africa, and South America; confirmation requires specific-gravity, streak, acid, or professional assay testing.
