Gold-Bearing River Stone / Placer Gold Ore Specimen
Raw Gold (Ore/Host Rock) · Natural Yellow Placer Gold within Host Rock
Purity: Estimated 20K to 22K (83% - 92% purity for internal flakes)
Type
Raw Gold (Ore/Host Rock)
Purity
Estimated 20K to 22K (83% - 92% purity for internal flakes)
Gold Type
Natural Yellow Placer Gold within Host Rock
Weight
5.0 to 8.0 grams total weight (inclusive of rock matrix)
Description
A naturally water-worn river stone acting as a host matrix for placer gold. The specimen shows a smooth, ovate shape typical of fluvial erosion. While the majority of the mass is silicate or metamorphic host rock, visible metallic yellow inclusions suggest the presence of gold flakes or 'flour gold' embedded within the surface crevices and internal structure. The matte texture of the rock contrasts with the high-luster metallic glints of the mineral inclusions.
Key Features
Naturally rounded edges from water transport; distinct yellow metallic luster (not brassy like pyrite); high density compared to common river pebbles.
Color & Finish
Tarnished grey-green host rock with bright metallic buttery-yellow specks and inclusions
Hallmarks & Stamps
None (Natural geological specimen)
Dimensions Estimate
Approximately 22mm x 15mm x 5mm; similar to a medium almond
Gemstones & Inlays
None; contains natural mica, quartz, or silicate mineral inclusions
Clasp & Closure
Not applicable
Chain & Links
Not applicable; smooth river-worn water-abraded exterior
Craftsmanship Details
Natural geological formation; sculpted by hydraulic erosion and abrasive sediment transport over time.
Authentication Indicators
Malleability (if probed), non-magnetic, heavy relative density, and lack of tarnish on yellow flakes (unlike pyrite or chalcopyrite). Identification as 'Fool's Gold' is a risk without streak testing.
Origin & Maker
Natural alluvial deposit; likely sourced from a riverbed or ancient stream channel
Era & Period
Geological (Holocene to Pleistocene alluvial deposit)
Age Estimate
Formed millions of years ago, deposited in current location within last 10,000 years
Cultural Significance
Gold nuggets and ore have been the catalyst for mass migrations, including the California Gold Rush of 1849, shaping the development of the American West.
Condition Notes
Natural condition; Grade: Raw Specimen. Surface shows natural pitting and geological weathering.
Value Estimate
Primarily specimen value; melt value is negligible (likely <0.5g total gold); estimated at $10-$40 USD as a collector's curiosity.
Care & Maintenance
Store in a dry container; clean with water and soft brush; avoid harsh chemicals that may dissolve the host rock matrix.
Similar Items
Pyrite (Iron Sulfide) or Chalcopyrite; often confused but distinguished by brittle structure and black/green streak test.
Interesting Facts
Most placer gold is found in 'pay streaks' at the bottom of gravel deposits where water velocity slows down, allowing the heavy gold to settle.