Natural Pyrite Specimen (Fool's Gold)
Raw Specimen (Mineral) · Brass-yellow Iron Sulfide (FeS2)
Purity: Non-aurum (0% Gold content)
Type
Raw Specimen (Mineral)
Purity
Non-aurum (0% Gold content)
Gold Type
Brass-yellow Iron Sulfide (FeS2)
Weight
15-25 grams (estimated based on size and density)
Description
This is a natural mineral specimen of Pyrite, historically known as Fool's Gold. It exhibits a classic brassy metallic luster with a distinct conchoidal to uneven fracture. The surface shows characteristic iridescent oxidation colors (blues and greens) caused by surface tarnish, and sharp, brittle edges typical of its cubic crystal system. Unlike gold, which is malleable, this specimen presents a rigid, crystalline structure with visible striations.
Key Features
Metallic luster, brittle fracture, iridescent surface oxidation, and high density relative to typical rocks.
Color & Finish
Brassy yellow with metallic luster and iridescent tarnish
Hallmarks & Stamps
None (Natural mineral specimen)
Dimensions Estimate
Approximately 2.5cm x 1.5cm x 1.2cm
Gemstones & Inlays
None; secondary mineralization suggests minor quartz or silicate matrix
Clasp & Closure
Not applicable (Raw mineral)
Chain & Links
Not applicable (Raw mineral)
Craftsmanship Details
Naturally formed; surface characteristics dictated by geological pressure and heat during crystallization.
Authentication Indicators
Red Flags: Brittle texture (gold is soft/malleable), dark gray streak (gold has a yellow streak), crystal faces, and iridescent tarnish not found on high-purity gold.
Origin & Maker
Natural geological formation; commonly found in Peru, Spain, or USA
Era & Period
Geological specimen (formative years: millions of years old)
Age Estimate
Geological age: Paleozoic to Cenozoic era
Cultural Significance
Often used as a talisman for protection and abundance in various folk traditions; historically significant for misleading prospectors during the Gold Rush.
Condition Notes
Good (Raw specimen). Minimal matrix attachment with minor surface bruising and oxidation.
Value Estimate
$5 - $15 USD (Decorative/educational value only; no precious metal melt value).
Care & Maintenance
Keep dry to prevent 'pyrite disease' (oxidation/decay); clean with a soft dry brush; avoid ultrasonic cleaners.
Similar Items
Chalcopyrite (softer and more colorful/peacock-like), Arsenopyrite (silvery-white), and Native Gold (significantly heavier and softer).
Interesting Facts
Pyrite can actually create sparks when struck against steel, which led to its use in wheel-lock firearms during the 16th century.