In-situ Gold Ore Vein in Quartz Host Rock
Raw Gold (Lode Deposit/Vein Gold) · Natural Yellow Gold (Native Element)
Purity: Variable, typically 80% to 92% (19K to 22K) in its natural native state. Natural gold is rarely 24K as it usually contains silver (forming electrum) or copper impurities.
Type
Raw Gold (Lode Deposit/Vein Gold)
Purity
Variable, typically 80% to 92% (19K to 22K) in its natural native state. Natural gold is rarely 24K as it usually contains silver (forming electrum) or copper impurities.
Gold Type
Natural Yellow Gold (Native Element)
Weight
Cannot be determined from image; requires specific gravity testing of the bulk specimen to estimate the 'gold to rock' ratio.
Description
This is a spectacular example of 'Visible Gold' in a quartz matrix, likely from a high-grade hydrothermal lode deposit. The gold is seen as irregular masses and thin sheets filling the fractures of the host rock, a classic 'Bonanza' grade appearance. This represents the primary source of gold before erosion turns it into alluvial/placer gold found in rivers.
Key Features
High-contrast 'Golden' appearance against quartz; jagged, hackly fracture typical of native gold; lack of crystal symmetry (distinguishing it from cubic pyrite).
Color & Finish
Rich buttery yellow with a metallic luster. The surface is raw, crystalline, and irregular, contrasting against the duller, translucent-to-opaque white/tan quartz and dark host rock.
Hallmarks & Stamps
None. As a raw geological specimen, there are no artificial stamps. Natural striations or crystalline structures serve as 'nature's hallmarks'.
Dimensions Estimate
Large scale specimen; visual context suggests a mine face or large boulder fragment, possibly 10-30 cm across the visible section.
Gemstones & Inlays
Natural Quartz (SiO2) host rock and potentially iron-rich sulfide minerals (pyrite/arsenopyrite) visible as darker inclusions.
Clasp & Closure
Not applicable (Raw Mineral).
Chain & Links
Not applicable; however, the gold shows a 'stringer' or 'leaf' distribution pattern through the quartz fractures.
Craftsmanship Details
Natural crystalline formation. No human craftsmanship; the 'finish' is the result of tectonic pressure and hydrothermal fluid cooling over millennia.
Authentication Indicators
Sectility (gold can be cut or deformed unlike brittle pyrite), metallic luster that does not change under different light angles, and association with milky quartz.
Origin & Maker
Natural geological formation; 'Mother Nature'. The 'Lera Projects' logo suggests a mining or exploration company based in Australia or Africa.
Era & Period
Geological (Precambrian to Cenozoic depending on the deposit location).
Age Estimate
Millions of years old, formed via hydrothermal deposition.
Cultural Significance
Representing the 'Gold Rush' era dream; such veins fueled the expansion of frontiers in California, Australia, and South Africa.
Condition Notes
Raw mining state. High structural integrity of the host rock. The gold appears fresh (unweathered) with no significant oxidation. Grade: High-grade specimen.
Value Estimate
Value is calculated as: (Spot Gold Price x Estimated Gold Weight) + (Specimen Premium). Collectors pay 2x-5x the gold value for aesthetically pleasing 'Gold in Quartz' specimens.
Care & Maintenance
Clean with distilled water only; avoid harsh acids that may dissolve the host rock minerals. Store in a stable environment to prevent the 'rusting' of associated iron sulfides.
Similar Items
Iron Pyrite (Fool's Gold), Chalcopyrite, and Mica. Pyrite is brittle and has a brassy, greenish-black streak, whereas natural gold is soft and yellow.
Interesting Facts
Most of the world's gold is found in these tiny 'microscopic' amounts; seeing visible 'jewelry-grade' gold directly in the rock like this is rare and represents a very rich find.