Auriferous Quartz Gold Ore Specimen
Raw Gold Ore (Lode Gold) · Native Yellow Gold within a Gossan/Quartz matrix
Purity: Natural native gold generally ranges from 70% to 95% (17K to 23K) purity when extracted from host rock, but is currently locked in a mineral matrix.
Type
Raw Gold Ore (Lode Gold)
Purity
Natural native gold generally ranges from 70% to 95% (17K to 23K) purity when extracted from host rock, but is currently locked in a mineral matrix.
Gold Type
Native Yellow Gold within a Gossan/Quartz matrix
Weight
Estimated 300 to 800 grams based on visible volume; the specific gravity of the host rock (approx 2.6) versus the gold (19.3) determines final weight.
Description
A rugged, heavy specimen of gold-bearing ore. This piece shows a heavy concentration of iron-stained matrix (gossan), which is a common indicator of precious metal deposits. The surface is weathered and irregular, typical of lode gold found in vein deposits rather than water-worn placer gold nuggets.
Key Features
High iron-oxide staining (red/brown), potential silification, and irregular vugs where gold mineralization often occurs.
Color & Finish
Natural earth-tones including iron-oxide reds, dark brown hematite, and greyish-white quartz. Any visible gold would appear as unpolished, buttery-yellow metallic flecks.
Hallmarks & Stamps
None; as a raw geological specimen, it lacks man-made stamps or hallmarks.
Dimensions Estimate
Estimated 8cm x 5cm x 4cm based on the texture of the ground surface in the background.
Gemstones & Inlays
No gemstones; contains mineral inclusions likely consisting of iron pyrite, limonite, and crystalline quartz.
Clasp & Closure
Not applicable; raw mineral specimen.
Chain & Links
Not applicable; naturally occurring geological formation.
Craftsmanship Details
Natural geological formation; hydrothermal deposition of minerals into fissures or veins within the earth's crust.
Authentication Indicators
Red flags: The image shows mostly host rock (iron-rich quartz); without a streak test or acid test, it is impossible to distinguish if gold is present or if it is merely iron pyrite ('Fool's Gold'). Authenticated by high specific gravity and presence of malleable yellow metal.
Origin & Maker
Naturally occurring; common in gold-bearing regions like California (USA), Western Australia, or the Witwatersrand Basin (South Africa).
Era & Period
Geological (Precambrian to Cenozoic depending on sourcing location); potentially millions of years old.
Age Estimate
Formation occurs over millions of years through hydrothermal or metamorphic processes.
Cultural Significance
Represents the 'Gold Rush' era of mining where lode deposits were the primary target for industrial mining operations.
Condition Notes
Raw 'as-found' condition. Surface is heavily oxidized with significant dirt and mineral buildup. Structural integrity is solid for a rock specimen.
Value Estimate
Specimen value is primarily based on the 'contained gold' (melt value) minus the cost of extraction, or as a collector's mineral specimen if gold is visible (typically $10-$100+ depending on proven gold content).
Care & Maintenance
Keep dry to prevent further oxidation of sulfide minerals; do not use harsh chemicals which may dissolve the host rock; clean only with water and a soft brush.
Similar Items
Iron Pyrite (Fool's Gold), Chalcopyrite, or Arsenopyrite specimens which can mimic the appearance of gold to the untrained eye.
Interesting Facts
Most of the world's gold is actually microscopic and locked inside rocks like this; free-milling gold visible to the naked eye is becoming increasingly rare.