Gold Ore in Host Rock (Quartz/Sulfides Matrix)
Raw Gold - Lode Gold / Vein Gold in Matrix · Native Yellow Gold; naturally occurring alloy commonly known as electrum if silver content is high.
Purity: Likely high fineness (20K-23K or 83% to 98% purity) typical of natural native gold, though it is currently locked in an ore matrix and and mixed with varying amounts of silver and copper.
Type
Raw Gold - Lode Gold / Vein Gold in Matrix
Purity
Likely high fineness (20K-23K or 83% to 98% purity) typical of natural native gold, though it is currently locked in an ore matrix and and mixed with varying amounts of silver and copper.
Gold Type
Native Yellow Gold; naturally occurring alloy commonly known as electrum if silver content is high.
Weight
Indeterminate based on visual; the total rock may weigh several pounds, but the visible gold content (the 'pay') appears to be in the milligram to gram range.
Description
A raw geological specimen featuring native gold embedded within a quartz-rich host matrix. The item shows classic hydrothermal vein characteristics with iron-oxide staining (limonite/hematite), indicating the weathering of sulfides which often leaves behind concentrated gold. This is a primary deposit (lode gold) rather than an alluvial (placer) nugget.
Key Features
Distinctive 'buttery' yellow color of gold contrasted against the crystalline/grainy texture of the quartz; lack of cleavage planes in the metallic yellow sections (indicative of gold vs mica).
Color & Finish
Dull to brilliant metallic yellow with an uneven, hackly surface texture; surrounded by tan, grey, and rust-colored (iron oxide) host rock.
Hallmarks & Stamps
None; as a natural specimen, it lacks man-made stamps or purity hallmarks.
Dimensions Estimate
The host rock appears to be roughly 3-5 inches (7-12 cm) in length; gold specks/veins are sub-millimeter to millimeter sized.
Gemstones & Inlays
None, though the host rock primarily consists of massive Quartz and potentially Pyrite (Fool's Gold) or Chalcopyrite.
Clasp & Closure
Not applicable (natural raw specimen).
Chain & Links
Not applicable (natural mineral formation).
Craftsmanship Details
N/A - This is a natural geological occurrence formed by the precipitation of gold from hot, mineral-rich fluids deep within the Earth's crust.
Authentication Indicators
Sectility (gold can be cut or dented without shattering), golden-yellow streak, and lack of tarnish. Note: Pyrite (Fool's Gold) will shatter when hit and has a greenish-black streak; Gold is malleable.
Origin & Maker
Natural geological formation; no human maker. Common in gold-bearing regions like the Mother Lode (CA), Yukon, or Western Australia.
Era & Period
Geological Era; typically formed hundreds of millions of years ago through hydrothermal deposition.
Age Estimate
Precambrian to Cenozoic depending on location; geologically ancient (millions of years old).
Cultural Significance
Representing the 'Gold Rush' eras of the 19th century, such specimens symbolize the raw wealth and the labor-intensive mining history of frontiersmen.
Condition Notes
Raw/Unrefined; the surface is weathered and shows signs of oxidation in the host rock. The gold is 'in-situ', meaning it has not been extracted or refined.
Value Estimate
Collector/specimen value typically exceeds the melt value of the gold itself. Value depends on the 'showiness' of the gold; as a raw ore sample, it may be worth $20 - $100+ to a mineral collector.
Care & Maintenance
Keep as a dry specimen. Avoid harsh chemicals that may dissolve the host rock. Do not use ultrasonic cleaners as it may cause the gold to detach from the matrix.
Similar Items
Iron Pyrite (Fool's Gold), Chalcopyrite, and Golden Mica (biotite). These are frequently mistaken for gold but differ in hardness and crystal structure.
Interesting Facts
Most of the world's gold was delivered to Earth via asteroid impacts over 4 billion years ago. Approximately 80% of the world's gold is still trapped within the Earth's crust in forms exactly like this specimen.