Gold-Bearing Quartz Host Rock Specimen
Raw Gold Ore (Lode Deposit) · Native Gold (Natural Alloy with Silver/Copper)
Purity: Likely 20K-23K (Native Gold content), though visible flecks are part of a mineral matrix comprising less than 1% of the total mass
Type
Raw Gold Ore (Lode Deposit)
Purity
Likely 20K-23K (Native Gold content), though visible flecks are part of a mineral matrix comprising less than 1% of the total mass
Gold Type
Native Gold (Natural Alloy with Silver/Copper)
Weight
250g - 400g (Total specimen weight including host rock)
Description
A rugged geological specimen featuring a heavy iron-stained quartz matrix, known as 'gossan' or 'iron hat' in prospecting terminology. The specimen displays a crumbly, oxidized surface with occasional metallic glints suggesting native gold or iron sulfides. This type of ore is characteristic of lode gold deposits where gold was precipitated from hot, mineral-rich fluids deep within the earth's crust.
Key Features
Reddish-brown iron oxidation, jagged quartz crystal protrusions, high-density host rock, and disseminated metallic inclusions.
Color & Finish
Brassy yellow metallic flecks embedded in a reddish-brown iron-stained quartz and gossan matrix
Hallmarks & Stamps
None (Natural geological specimen)
Dimensions Estimate
8cm x 6cm x 4cm (Hand-sized specimen)
Gemstones & Inlays
Crystalline quartz, iron oxides (limonite/hematite), and potential sulfide minerals like pyrite
Clasp & Closure
Not applicable (Raw mineral specimen)
Chain & Links
Not applicable (Rough natural crystal structure)
Craftsmanship Details
Natural geological formation; hydrothermal deposition and subsequent tectonic fracturing.
Authentication Indicators
The lack of uniform geometry and presence of iron oxides are consistent with gold-bearing ore; however, 'Fool's Gold' (pyrite) is a common lookalike. Testing for malleability or specific gravity is required for confirmation.
Origin & Maker
Natural terrestrial origin; typically from a hydrothermal vein deposit
Era & Period
Geological time scale (Millions of years old)
Age Estimate
Precambrian to Cenozoic (Geological age of the host rock formation)
Cultural Significance
Represents the 'Gold Rush' era of mining where such rocks were crushed and processed using mercury or cyanide to extract the precious metal.
Condition Notes
Raw/Unprocessed. Significant weathering and oxidation on the surface. Structural integrity is typical for friable quartz ore.
Value Estimate
Specimen value $20 - $100 depending on actual gold content; melt value is likely negligible unless gold concentration is high throughout the core.
Care & Maintenance
Keep dry to prevent further oxidation of sulfide minerals; handle with gloves as the edges can be sharp and the iron staining can rub off.
Similar Items
Iron Pyrite (Fool's Gold) in Shale, Chalcopyrite, or Auriferous Quartz (High Grade).
Interesting Facts
The reddish-brown color comes from the oxidation of iron-bearing minerals, which prospectors historically used as a primary indicator for finding gold-rich quartz veins.