Gold Ore Specimen in Host Rock
Raw Gold Ore (Matrix-hosted) · Native Yellow Gold within Sulfide/Quartz Matrix
Purity: Indeterminate; requires assay. Contains microscopic native gold particles (typically 18K-24K purity) embedded in non-precious minerals.
Type
Raw Gold Ore (Matrix-hosted)
Purity
Indeterminate; requires assay. Contains microscopic native gold particles (typically 18K-24K purity) embedded in non-precious minerals.
Gold Type
Native Yellow Gold within Sulfide/Quartz Matrix
Weight
30 to 60 grams (Total specimen weight including host rock)
Description
A raw mineral specimen consisting of a dark, dense matrix likely composed of basalt, quartz, or sulfide minerals, containing disseminated gold-colored inclusions. This represents 'hard rock' gold before extraction and refining. The specimen shows a ragged, unpolished surface typical of hand-prospecting or mining tailings.
Key Features
Presence of metallic yellow flecks against a dark silicate/sulfide background; heavy density relative to size; lack of geometric crystal faces in the gold (suggesting native gold rather than pyrite).
Color & Finish
Dull dark grey to metallic brassy host rock with localized speckles of bright golden yellow. Natural crystalline/earthy fracture finish.
Hallmarks & Stamps
None; natural geological specimen.
Dimensions Estimate
Approx. 40mm x 35mm x 15mm (Pebble-sized specimen)
Gemstones & Inlays
None. Possible presence of Pyrite (Fool's Gold) or Arsenopyrite as associated minerals.
Clasp & Closure
Not applicable (Raw mineral specimen).
Chain & Links
Not applicable. Host rock displays a fine-grained, crystalline geological structure.
Craftsmanship Details
Forged by geological pressure and hydrothermal activity. No human craftsmanship involved.
Authentication Indicators
Visual 'glint' that remains consistent regardless of viewing angle; color stays rich yellow even in shadow (unlike pyrite which turns greenish-black); sectility (gold is soft/malleable, pyrite is brittle). Red flag: Likely contains high percentage of non-gold minerals, meaning total gold volume is very low.
Origin & Maker
Natural geological origin; possibly from a hard-rock mining district (e.g., California Mother Lode, Witwatersrand, or Australian goldfields).
Era & Period
Geological / Prehistoric formation.
Age Estimate
Primary mineralization likely occurred millions of years ago (e.g., Paleozoic or Mesozoic era).
Cultural Significance
Represents the 'Gold Rush' era of prospecting and the fundamental starting point of all gold jewelry and currency throughout history.
Condition Notes
Raw/Natural. Structural integrity is solid but brittle. Surface shows significant oxidation and weathering typical of raw ore.
Value Estimate
Primarily specimen/collector value ($10-$50 USD). The 'melt value' is likely negligible without professional refining as the gold content is a small fraction of total weight.
Care & Maintenance
Keep dry and store in a display case. Do not wash with harsh chemicals as it may cause the host rock to crumble or oxidize further. Use a soft brush for dusting.
Similar Items
Iron Pyrite (Fool's Gold) specimens, Chalcopyrite, Mica-rich schist, and Gold Quartz specimens (jewelry-grade).
Interesting Facts
Most gold is found in tiny, invisible particles within such rocks. To extract the gold from this specimen, it would typically need to be crushed to powder and chemically treated (cyanidation or smelting).