Lode Gold in Quartz Vein with Pyrite
Raw Gold (Lode/Vein Host) · Native Yellow Gold (Geological Mineral)
Purity: Natural gold ranges from 16K to 23K (66-96% fineness). Native gold is rarely 100% pure, often alloyed with silver (electrum) or copper.
Type
Raw Gold (Lode/Vein Host)
Purity
Natural gold ranges from 16K to 23K (66-96% fineness). Native gold is rarely 100% pure, often alloyed with silver (electrum) or copper.
Gold Type
Native Yellow Gold (Geological Mineral)
Weight
Undetermined; the visible metallic luster belongs largely to host mineralizations like pyrite. Extractable gold would likely be measured in grams per tonne (g/t) of ore.
Description
A raw geological specimen showing a hydrothermal quartz vein cutting through dark host rock. The vein contains metallic mineralizations with a brassy yellow hue, characteristic of 'Lode Gold' or 'Fool's Gold' (Pyrite).
Key Features
Hydrothermal quartz stringers, metallic cubic/granular mineral inclusions, and dark basaltic or metamorphic host rock.
Color & Finish
Brassy yellow to pale metallic gold. Surface is rough, crystalline, and unpolished, exhibiting a natural metallic luster against the duller host rock.
Hallmarks & Stamps
None. As a raw geological specimen, it lacks man-made markings or purity stamps.
Dimensions Estimate
The visible vein appears to be approximately 2-5 inches in width based on the scale of surrounding rock textures.
Gemstones & Inlays
None. Contains natural crystalline quartz and likely iron sulfides (pyrite/chalcopyrite).
Clasp & Closure
Not applicable; raw mineral specimen.
Chain & Links
Not applicable; geological formation involves hydrothermal vein deposition.
Craftsmanship Details
Natural crystalline structure formed by geological pressure and heat.
Authentication Indicators
Red Flag: The metallic sections show a greenish-black or brassy tint and brittle texture typical of pyrite. Native gold is more buttery-yellow, sectile (cuttable), and does not tarnish.
Origin & Maker
Natural geological origin; formed via hydrothermal fluid deposition in bedrock fractures.
Era & Period
Pre-Cambrian to Cenozoic depending on the local geology (millions of years old).
Age Estimate
Geological age, likely millions of years old based on the metamorphic/igneous host rock.
Cultural Significance
Represents the primary source of wealth during the 19th-century gold rushes in California and Australia.
Condition Notes
Natural, in situ (in place). Surface is weathered and wet, which can exaggerate the luster of sulfide minerals.
Value Estimate
Minimal as a jewelry item; value is based on the 'Grade' (ounces of gold per ton of rock) after processing.
Care & Maintenance
Keep dry to prevent oxidation of sulfide minerals; professional assay is required to determine actual gold content.
Similar Items
Iron Pyrite (Fool's Gold), Chalcopyrite (Copper Ore), and Mica flakes.
Interesting Facts
Most ‘gold’ found in quartz veins by hikers is actually iron pyrite. Real gold is malleable and can be flattened with a needle point, whereas pyrite will shatter.