Gold-Bearing Quartz Ore Specimen
Raw Gold (Gold Ore in Matrix) · Natural Native Gold deposited in a silicate/quartz sulfide-rich matrix.
Purity: Likely 20K to 23K (Native Gold) within the host rock, representing low-grade ore concentration.
Type
Raw Gold (Gold Ore in Matrix)
Purity
Likely 20K to 23K (Native Gold) within the host rock, representing low-grade ore concentration.
Gold Type
Natural Native Gold deposited in a silicate/quartz sulfide-rich matrix.
Weight
350g - 500g (Total specimen weight including host rock/matrix).
Description
A rugged, dense specimen of primary gold ore. The piece features a dark, mineralized matrix with visible metallic inclusions. The surface shows Moire-like rainbows which are likely digital artifacts of the photo or thin-film interference on oxidized sulfide minerals. Unlike alluvial nuggets, this 'lode gold' is still embedded in the rock where it was deposited by hydrothermal fluids.
Key Features
Heterogeneous mineral composition, heavy specific gravity relative to size, and jagged, unpolished surface texture typical of hard-rock mining.
Color & Finish
Raw, earthy, and metallic; displays dark grey to brownish hostess rock with scattered metallic lusters and iridescence (likely from sulfide oxidation).
Hallmarks & Stamps
None; as a natural geological specimen, it lacks man-made purity or maker stamps.
Dimensions Estimate
Approx. 8cm x 6cm x 4cm; fits within the palm of a hand.
Gemstones & Inlays
None; however, the matrix contains micro-crystalline quartz and potentially iron-rich sulfide minerals (pyrite/arsenopyrite).
Clasp & Closure
Not applicable (Raw Ore).
Chain & Links
Not applicable (Rough geological structure).
Craftsmanship Details
Natural geological formation; no human craftsmanship involved. Shape is determined by the fracture patterns of the host rock during mining.
Authentication Indicators
Metallic luster indicates presence of minerals; however, the lack of distinct yellow 'leaf' or 'wire' gold suggests it is low-grade ore or possibly 'fool's gold' (Pyrite) without assay. Professional XRF testing is required.
Origin & Maker
Natural geological origin; commonly found in hard-rock mining districts like California, Australia, or South Africa.
Era & Period
Geological/Prehistoric formation (Cenozoic to Precambrian depending on locality).
Age Estimate
Natural formation billions or millions of years old; recently extracted from a lode deposit.
Cultural Significance
Represents the 'Gold Rush' heritage of hard-rock mining; symbolizes the raw wealth of the Earth before industrial refinement.
Condition Notes
Raw/Unfinished state; significant fragmentation from extraction. Surface shows natural weathering and oxidation of secondary minerals. Structural integrity is solid but brittle.
Value Estimate
Specimen value: $20 - $100 USD. Melt value: Negligible until processed, as gold content per ton of such ore is typically measured in grams.
Care & Maintenance
Keep dry; minerals like pyrite can oxidize and 'rust' (pyrite disease). Store in a display case away from high humidity. Clean only with air or soft dry brush.
Similar Items
Iron Pyrite (Fool's Gold), Chalcopyrite, Arsenopyrite, and high-grade Gold-in-Quartz specimens.
Interesting Facts
Most gold produced globally comes from ore exactly like this, where the gold is often invisible to the naked eye and must be chemically extracted through crushing and cyanidation.